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ARISTO 90117 specially commissioned Aqua-Math for calculating the water content of tobacco leaves
ARISTO 90107 specially commissioned model for calculating the lifespan of filament lightbulbs
Koch, Huxhold & Hannemann (KHH) - made the surprising System Korte slide rule that does addition & subtraction
Smallwood Folding Shoe Sizing Stick in metric for French shoe sizes 10-48 in increments of a Paris point (⅔ cm)
Lawrence MIT Antenna slide rule for radar antenna performance was classified during WWII by UK & US governments
ALRO-made ruler unusually with a cursor for analysing ECG printouts of the cardiac Sinus Rhythms
Hatters Gauge - for measuring the size of a hat but unusually calibrated in metric & imperial
Glovers Rule - for measuring the length of a glove in imperial inches
Unusual non-logarithmic QR 41 military model by Dennert & Pape (D&P) for training anti-aircraft gunners
Colour combinations slide rule made by German WH-Wohnen for Interior Designers
Professor Fuller’s Drum Calculator from 1878 - made by W.F. Stanley
Modern wristwatch with slide rule bezel calculator made by German maker Kienzle
Ruxton made Multi-Vider combined drop-lead pencil & slide rule
Rare Otis King Model N for Retail & Monetary with white scales (422 & 424) on a black background
Darnley’s Rotable Lightning Calculator/Pencil Case calculating aid
Makeba made Kombinator combination pencil & slide rule
Rare Carbic-made Fischer Calculator slide rule
Specialist slide rule for a national home cable radio broadcasting system offered in The Netherlands from 1930 to1970
Smallest drum (≈ 2.4m) made by renowned Swiss maker LOGA

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Interested in finding out more out about such calculating wonders? Then try one of the slide rule related articles (often light-hearted) I have published.
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Search results: Click on any Model listed in the leftmost column (or its image) for the full specification OR hover over its "Thumbnail" image (if shown) for a pop-up enlargement

You searched for: Danfoss

Model	Type	Material	Comments	Thumbnail
520H4713	Refrigerant	plastic	No slide
Calculator	Heating flue gas losses	plastic	Calculations based on a standard calorific value of fuel oil - back of calculator gives fuel oil nozzle capacities
(NoName)	Pocket Refrigerant - early	plastic	No slide
(NoName)	Refrigerant	plastic	No slide
RT.00.A1.00	Refrigerant	plastic	No slide
RT.00.A2.00	Refrigerant	plastic	No slide
RT.0X.A5.00	Refrigerant	plastic	No slide