Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Circular and Spiral Slide Rules
ALRO / 200 R
ALRO (All-Round)
Ø 13 cm
General calculations

Notes: From ALRO's main range of slide rules where characteristically the metal box/lid doubles as a desk stand. The design of the fixed and moving discs was patented by ALRO. Capital letter H next to the central nameplate may be a country code for Holland.

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