Slide chart made for Dutch high street bank ABN (later merged with another bank to become ABN-AMRO) for calculating compound interest monthly payback on a 100 Dutch Gulden loan for rate of 11 to 15.5% (front) & 15.75 to 20% (back) for durations of 12 to 60 months  

Slide Chart version 04a to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic & converting time across 7 times zones for 28 cities around the world

Ruler/protractor to promote/advertise ALRO company  

Ruler to promote/advertise ALRO company & their PVC products + special version for Amsterdam Efficiency Fair of 1986

Ruler to promote/advertise ALRO company & durability of their ALRODEREN process for German market

Ruler made to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic + image of office facade in The Hague + horse-head company logo 

Ruler made to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic + coloured image of office facade in The Hague + horse-head company logo 

Ruler come sampler for to promote ALRO's trade-marked process ALRODEREN or laminating paper in thin plastic for their head office and only German subsidiary

Sampler to promote/advertise ALRO company & quality of their ALROPRINT (synonymous TM with ALROCARD) finish 

Slide chart made for Dutch research-driven global pharmaceutical company Boehringer Ingelheim for calculating  probability of myocardial infarction (heart attack) in patients with history of heart problems + AMI-RO = Acute Myocardial Infarction Rotterdam ​

Slide chart made for Swedish pharmaceutical company Astra that merged with British Zeneca Group in 1999 to form AstraZeneca for finding the anaesthetic pain control dosage for 31 different types of surgical operation  

​Slide chart for calculating optimum drilling of wells according to factors such as penetration rate, drill speed, hydraulic pressure drop, etc + B.I.P.M. = Bataafse Internationale Petroleum Maatschappij or forerunner of company now known as Shell

Slide chart for calculating needed & allowable maximum mud weight for a drilled & flowing well according to factors such as depth, pressure within drill pipe, annular surface pressure, etc + B.I.P.M. = Bataafse Internationale Petroleum Maatschappij or forerunner of company now known as Shell

Slide chart version 04e made for Belgium Bank Brussel Lambert (BBL) (Tradelink was the name of their network but bank later acquired by Dutch ING bank) for converting time across 7 times zones for 28 cities around the world

Slide chart made for 100% plant-based organic branded bioNorm proteins to convert Joules to Calories 

Ruler made for German pharmaceutical company Boehringer Ingelheim & designed by F.A.M. Harms for analysing ECG printouts of cardiac Sinus Rhythms - read more ….  

Slide chart made for Dutch distillery Lucas Bols for mixing 30 different cocktails + tips for mixing drinks on back of slide

Slide Chart version 04a made for Dutch sales promotion company BOVI for converting time across 7 times zones for 28 cities around the world

Slide chart designed by Dutchman Wim Granneman in 1975 to calculate how to alter/change flowering/harvesting time of tulip bulbs + can also be used for other perennials & other countries with different seasons + issued by Dutch International Flower Bulb Centre

Slide chart made for defunct Dutch factory making printing forms of illustrations Clichéfabriek Maastricht for calculating % reduction/increase when for typesetting/engraving 

Slide chart for defunct Dutch subsidiary of USA machine tool builder Cincinnati Milacron with copyrighted design (1 moving ring) for calculating grinding parameters  + see also advanced sibling

Slide chart for defunct Dutch subsidiary of USA  machine tool builder Cincinnati Milacron with copyrighted design (2 independently moving rings) for calculating grinding parameters  + see also basic sibling

Slide chart/nomogram (n.b. not a slide rule) made for Dutch supplier of photographic darkroom products LiCi Colorstar for calibrating their early range of colour analysers in combination with a test print

Ruler (unusually fitted with a cursor) made for American pharmaceutical company Wyeth-Ayerst Laboratories (acquired by Pfzier in 2009) & registered brand name owner of Cordarone (drug for irregular heart beats) for analysing ECG printouts of cardiac Sinus Rhythms - read more ….  

Ruler (unusually with a cursor) probably prototype for American pharmaceutical company Wyeth-Ayerst Laboratories (acquired by Pfzier in 2009) & brand name owner of Cordarone (drug for irregular heart beats) for analysing ECG printouts of cardiac Sinus Rhythms + unlike sibling has plain back 

Slide chart DAST = DAtum (date) STandaard (standard) is a perpetual calendar for the years 1300 to 2499

Slide Chart version 04c made for defunct Euro-American card manufacturer Data Card (they later bought ALRO & in turn was acquired by conglomerate Entrust) for converting time across 7 times zones for 28 cities around the world

Slide Chart version 04d made for defunct Euro-American card manufacturer Data Card (they later bought ALRO & in turn was acquired by conglomerate Entrust) for converting time across 7 times zones for 28 cities around the world

Slide chart made for defunct Belgium photo engravers De Buck & Paulich for calculating % reduction/increase when for typesetting/engraving 

Slide Chart version 04a made for Dutch guild of artisan bakers De Echte Bakker for converting time across 7 times zones for 28 cities around the world

Slide chart made for Dutch construction company Gebr. de Kinkelder B.V. for calculating spread of workable days/month throughout the year - front for maximum of 200 working days/year & back for maximum of 191 (allowing for lost days due to high winds) working days/year  

Slide chart/ruler made for Dutch insurance company Delta Lloyd with unusual mirrored (anamorphosis) scale to measure thickness of framed glass by placing the bevelled top edge against the glass surface & reading off the thickness from the reflection

An architects ruler made for defunct Dutch construction company Demabao Systeembouw  

Slide chart made for defunct Dutch steel wholesaler Dikema en Chabot for calculating size & weight for a given length of steel bar with either a H or U profile 

Slide chart for defunct Belgium cattle-feed supplier (factories in Deinze & Zolder) Dossche for calculating the estimated respective gestation time for pigs, sheep, cattle & horses

Template made for defunct Dutch construction company Electra LAS COmbinatie Nederland (Elascon) for drawing profiles of metal roofing or cladding panels   

Slide chart for calculating power, efficiency & wiring of electric motors + EMF DORDT = nickname of defunct Dutch company Willem Smit & Co.‘s Electromotorenfabriek that produced large commercial electrical motors

Slide chart made for defunct Dutch wallpaper company Eerste Twentse Behang Industrie (ETBI) for calculating total price in Dutch Gulden for buying 7 to 12 rolls of wallpaper in price range of fl 1.20 to 5.85/roll  

Slide chart for defunct Finish company Finncell showing location, capacity & types of product produced at each of their 29 wood pulp/cellulose mills in Finland    

Slide rule/slide chart for calculating sound levels in dB for building facades - © 1983 design by ministerie  V en M = now defunct Dutch Ministerie van Volksgezondheid en Milieuhygiëne (Ministry of Health and Environmental Hygiene)

Slide chart made for Belgium manufacturer of photographic paper L. Gevaert & Cie (later became Belgium-German multinational company Agfa-Gevaert) for calculating how to optimally reproduce photographic images mechanically using an inked plate created from a photographic negative  

Slide chart made for defunct Dutch chemical & pharmaceutical company Gist-Brocades N.V. for calculating % of water to flour needed for 30 small or large pieces of dough for 13 different types of bread  

For air pressure & flow calculations + GRASSO-PERSLUCHT = Dutch company for industrial refrigeration equipment + table of constants/conversion factors & ALROPRINT on back 

Slide chart for converting heat transfer values in central heating systems + gti installatietechniek = Dutch plumbing company + ALROPRINT & © TRD/1977/10

Slide chart look-up table on back to help select most suitable heating pump for commercial use (e.g. greenhouses) from HA-ES “perfecta” range made by defunct Dutch company Meppeler Machinefabriek

Slide chart for defunct Dutch car parts retailer HAVAM for torque settings + pressure & usage conversion tables  

Slide chart for defunct Dutch car parts retailer HAVAM for converting UK/USA imperial values to metric  

Ruler made for American multinational IT company Hewlett Packard (HP) & designed by F.A.M. Harms for analysing ECG printouts of cardiac Sinus Rhythms - read more ….  

Slide chart made for German chemicals/life-sciences company Hoechst AG (later became Sanofi Aventis) using a pair of dividers to measure size of elliptic skin sores (Laesiomat is Latin for hurting) & calculate area in mm² + adverts for branded skin salves on back 

Ruler Cor-V-Mat® incorporating nomograms made for German chemicals/life-sciences company Hoechst AG (later became Sanofi Aventis) & designed by Prof. Keuskamp for analysing ECG printouts of cardiac Sinus Rhythms - read more ….  

Slide chart made for defunct Dutch producer of oxygen & other gases Hoek Look for Amsterdam Infant Ventilator Machine designed by Prof. Keuskamp for calculating respiration flow rates & air/oxygen flow rates 

Ruler made for American International Business Machines (IBM) for working in Cicero, Pica & IBM typographic units with typewriters

Ruler made for American International Business Machines (IBM) for working in Points, Cicero, Pica & IBM typographic units in desk-top publishing 

Slide chart made for & © designed by KK/TRD consisting of consisting of 4 rings of energy saving tips ranked by low/medium/high investment levels for: (i)  heating systems (front) or (ii) lighting, energy & sanitation (back) 

Slide Chart version 04c made for Dutch airline KLM for converting time across 7 times zones for 28 cities around the world

Slide Chart made for Dutch airline KLM for calculating dimensional or volumetric weight (imperial or metric) based on a package's length, width & height using benchmark of either 7 cubic decimetres = 1 kg or 194 cubic inches = 1 Lb 

Slide chart made for frequent flyer/loyalty programme of Dutch airline KLM for converting time across 7 times zones for 117 KLM destinations around the world 

Slide Chart for Dutch airline KLM for calculating the BMEP (Brake Mean Effective Pressure) for 3 series' of engine   

Slide chart for calculating resistance in pipes (front) & pump capacity needed (back) + KNM Begemann = defunct Dutch company Koninklijke Nederlandsche Machinefabriek v/h E.H. Begemann manufacturing pumps & steel constructions + table of resistance values on back ​

Slide chart with © design made for a consortium of 4 Dutch regional newspapers so customers for calculating advertising costs of a chosen layout & size (once-off or repeated) in Dutch Gulden + cm & Cicero scales on back    

Slide chart with © design made for a consortium of 4 Dutch regional newspapers so customers for calculating advertising costs of chosen layout & size (once-off or repeated) in Dutch Gulden - cm & Cicero scales on back + maybe prototype for white version as without cut-outs for easy movement of slide

Slide chart eating guide made for Dutch subsidiary of American pharmaceutical company Eli Lilly & jointly issued with the Dutch Diabetes Society for finding kcal, Kh(g) & MK (= meal code) values for many types of food & drink 

Slide chart made for founding company Organaon for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organisation that extracts hCG hormone from the urine to create fertility medicines + see also larger version

Slide chart for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organisation that extracts hCG hormone from the urine to create fertility medicines + see also pocket versions

Slide chart for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organiation that extracts hCG hormone from the urine to create fertility medicines + see also larger version 

Slide chart for pregnant mother’s in early stages of pregnancy for planning when to donate urine to help other couples with fertility problems + Moeders voor Moeders = Dutch pharmaceutical organisation that extracts hCG hormone from the urine to create fertility medicines + see also larger version

Slide Chart version 04d made for American biopharmaceutical company MSD (Co-Renitec is brand name for a high blood pressure treatment) for converting time across 7 times zones for 28 cities around the world

Slide rule/slide chart for predicting traffic sound levels according to several parameters such as type of road, type of vehicle, etc according to design by H.J. van Zuylen + Nationale Verkersakademie Tilburg = defunct Dutch technical school in Tilburg for educating traffic specialists

Slide rule/slide chart for predicting traffic sound levels according to several parameters such as type of road, type of vehicle, etc according to design by H.J. van Zuylen + Nationale Verkersakademie Tilburg = defunct Dutch technical school in Tilburg for educating traffic specialists

Slide chart made for defunct Dutch digital printers Nauta &  Haagen (later Kampert-Nauta) for calculating % reduction/increase when for typesetting/engraving 

Slide chart version 04b made for Dutch consultancy consortium Nederlandse Export Combinatie (NEC) for converting time across 7 times zones for 28 cities around the world 

​Slide chart for calculating the significance between two independent statistical samples + NIPO = Nederlands Instituut voor Publieke Opinie (Dutch institute for public opinion) + table of conversion factors for reliability on inner slide

Slide chart made for unnamed company or organisation (but where form. 5007 03-90 60.06 has some meaning) for calculating duration in hours (maximum two weeks) between two daytime timeslots in a calendar week

Unusual slide rule/slide chart/nomograms (2 x Ø 7½cm discs) made for unnamed company or organisation (but Ka6 is a single-seater glider built by Alexander Schleicher GmbH & Co in Germany) for use as simple flight computer & for wind speed conversion + flying check-lists on back 

Protractor/ruler without any branding but classic 180⁰ scale is paired with NATO military favoured alternative: MILS   

Slide chart made for Dutch founded healthcare company Nutricia that later became part of French conglomerate Danone for calculating, according to a baby's weight, number & size daily doses for 6 baby food/nutrition products   

​Slide chart with © design Dept. of Transport & Public Works of The Netherlands for predicting the probable outcome of an oil spill based on spread, drift, mass balance, evaporation, dispersion & emulsification

Nomogram made for global healthcare company Organon showing contraception efficacy of 2 estragon & 9 other oral contraceptives for differing parts of menstrual cycle  

Slide chart made for Dutch electronic multinational Philips for determining Acceptable Quality Level % (AQL) according American military defence standard (MIL-STD-105-D) showing maximum acceptable number of defects for a given batch size with either Single or Double samples for: Normal (N), Tightened (T) & Reduced (R)

​Slide chart for Dutch electronic multinational Philips for calculating dB decibel ratios & converting them into various current, voltage & power ratios + 1 of 3 versions

Slide chart made for Dutch electronic multinational Philips with © design for their P300 bookkeeping minicomputer showing available functions according memory sectors A to S

Slide chart/nomogram for ELA (Electro-Acoustiek) division of Dutch electronic multinational Philips for calculating dB decibel ratios & converting them into various current, voltage & power ratios + 1 of 3 versions

Slide chart/nomogram for ELA (Electro-Acoustiek) division of Dutch electronic multinational Philips for calculating dB decibel ratios & converting them into various current, voltage & power ratios + earliest of 3 versions  

Slide chart made for Dutch electronic multinational Philips for calculating foetal size & age from crow-rump length (CRL) or foetus length from top of head to bottom of torso & biparietal scull diameter (BPD) ultrasound results

Slide chart for Dutch electronic multinational Philips to  check specificatiions for OC series of tansistors 

Slide Chart (later version) made for Dutch electronic multinational Philips for showing 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Miniwatt range of valves + see earlier sibling  

Slide chart (early version) made for Dutch electronic multinational Philips for showing 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Miniwatt range of valves + see also later sibling  

Nomogram made for Dutch electronic multinational Philips for designing 6 different carbon film resistors with 3 different resistor values 

Slide chart made for Dutch electronic multinational Philips for step-by-step set up/troubleshooting schematics & settings of XG 7100/XG 7104 TV control unit

Slide chart designed as planisphere by Dutchman R. Walrecht to calculate star positions & star signs at latitude 52º North & longitude 5º East for given date & time + just 1000 made but later versions made by PlantijnCasparie 

Slide chart made for Dutch branded pregnancy test Planosec showing the pregnancy cycle in weeks/months from 1st day of last menstruation to expected date of birth    

Slide Chart made for Dutch lightbulb maker Pope (later taken over by Dutch electronic multinational Philips) for showing the 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Philips valves + see later Philips version

Ruler made for defunct Dutch medical electronics company Portanje Elektronika & designed by F.A.M. Harms for analysing ECG printouts of cardiac Sinus Rhythms  - read more ….  

Slide Chart version 04c made for Dutch paint company Primap Coatings for converting time across 7 times zones for 28 cities around the world

Slide rule/slide chart for calculating radioactive doses & intensities from a 1978 patented design (US4117315) from C.G.F. Amy & K.K. Keimpema+ issued as 4/8/1075/76346 by PTT = Posterijen, Telegrafie en Telefonie or old Dutch post, telegraph & phone company

Slide chart made for medicine trade name Questran for calculating number of daily doses of cholestyramine to reduce cholesterol - these days drug largely replaced by statins 

Slide rule/slide chart made for Dutch military personnel (NATO NSN no. 6665-17-055-1115) to calculate the effects & fall out directly after a nuclear explosion

Slide chart with unusual construction & colour-coding for for choosing resistors & capacitors with appropriate values & tolerances 

Slide chart made for defunct Belgium agrochemical company N.V. Schering S.A. for calculating the the appropriate use of pesticides when growing beetroot  

Slide Chart made for Shell for normal & heavy-duty metal bolts per ASA & BS tables in inches & mm & according the Shell's Group 81 MESC (Material and Equipment Standards and Code) catalogue specification

Slide rule/slide chart for predicting overall railway trackside noise level in dB(A) according to several parameters e.g. noise screen, type & frequency of trains, average speed, etc - ALROPRINT 922130

​Slide chart converting viscosity values between various standardised units + SYRES = Dutch company (still operating) specialising in commercial coatings & resins for buildings, boats, cars, etc 

Slide chart (in various colours) for designing cast meral pipe flanges & fittings according to ANSI standard B16 + Tebodin is an abbreviation for “Nederlandsch Technisch Bureau voor Ontwikkeling der Industrie” (Dutch Technical Bureau for Development of Industry) founded by Frederik van Iterson in1945  

Slide chart (in various colours) for designing cast metal pipe flanges & fittings according to ANSI standard B16 + Tebodin is an abbreviation for “Nederlandsch Technisch Bureau voor Ontwikkeling der Industrie” (Dutch Technical Bureau for Development of Industry) founded by Frederik van Iterson in1945  

Slide chart made for registered brand name Teronac (generic name for slimming drug no longer normally available) to calculate an individuals Body Mass Index (BMI) based just on metric height & weight

Ruler made for Dutch Organistie Voor Toegepast Natuurwetenschappelijk Onderzoek (TNO or Organisation for Applied Scientific Research) Instituut voor Bouwmaterialen en Bouwconstructies (IBBC or Institute for Building Materials & Construction) to measure cracks in walls   

Slide chart possible made as prototype to show 8-pin layout (a=anode, f=filament, g=grid, h= heated, k=cathode & i.c.= internally connected) of Miniwatt range of valves + see later Philips production version

Slide chart made for Germany company Valvo (when still part of electronic multinational Philips) for designing different low-frequency transistors

Slide chart made for 40th anniversary of Dutch training organisation Stitching VAM (these days called Innovam & for cars) for calculating annual financial yield in Dutch Gulden for shops selling 100 to 700 bicycles/year  

Slide chart for looking-up DIN & NEN standard sizes for nuts & bolts according to ISO & Whitworth standards + VERCOMBI refers to a joint purchasing company of the day for Dutch makers of screws & bolts Nedschroef & EWES  + see also sibling version

Slide chart/slide rule by Dutch supplier of farming machinery VICON (VIssers Construction Nieuw-Vennep) for calculating fertilizer distribution + see also sibling version

Slide chart with © design by Dutch supplier of farming machinery VICON (VIssers Construction Nieuw-Vennep) for calculating fertilizer distribution + see also sibling version

Template/ruler (opaque) made for defunct Dutch IT company Volmac (later became part of Capgemini) for documenting with symbols processes & tasks which need to occur in a particular order

Template/ruler (opaque) made for defunct Dutch IT company Volmac (later became part of Capgemini) for documenting with symbols processes & tasks which need to occur in a particular order

Slide chart for looking-up DIN & NEN standard sizes for nuts & bolts according to Metric & Whitworth standards + VvS refers to a joint purchasing company of the day for Dutch maker of screws & bolts Verkoopkantoor voor Schroefbouten + see also sibling version

Nomogram made for defunct Dutch company Zyma-Nederland to help doctors by showing expected kidney renal function/performance levels for creatinine clearance & serum creatinine based on a patient's age & weight (n.b. underlying formulas now considered obsolete) 

Slide chart designed as planisphere by Dutchman R. Walrecht to calculate star positions in Northern Hemisphere for given date & time but in a special eclipse of the sun (11/08/1999) edition showing positions of sun, moon, planets & perseids meteor storm + based on version made by ALRO

Slide chart designed by Dutchman W. Granneman in 1975 to calculate how to alter/change flowering/harvesting time of tulip bulbs + can also be used for other perennials & other countries with different seasons + issued by Dutch International Flower Bulb Centre - see original by ALRO