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