Vtg Otis King's Patent Cylinder Calculator Slide Rule Model K & Box Carbic 1960s

Vintage Otis King’s Pocket Calculator Cylindrical Slide Rule Model K #J

Otis king slide rule calculator 6" Vintage Scientific Instrument Made In England

Telescopic Slide Rule. Otis King’s Patent No 183723. N6055.

Early 1920's type A Otis King's model K pocket calculator in fitted case

Sinclair Sovereign Calculator black - in box + case + operating instructions

CAMBRIDGE INDICATOR Vintage Steampunk Industrial Instrument ~ C02 Gauge Dial

Vintage Ottis King 4210 Slide Rule Calculator Boxed With Instructions/Ruler