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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Pocket Watch Slide Rules
K&E / Sperry Calculator Type 3C
Keuffel & Esser
USA
Metal/glass/paper
1904-1940
Ø 5.4 cm
Basic Calculations
Notes:
Besides being a pocket-watch model this example is also a long-scale type. Serial number is S997.
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