Strode Adding Machine for Accounting. The base of this Patent Office model for a circular stylus-operated adding machine is a wooden paddle. The outer edge of the paddle is divided clockwise into 100 parts, which are marked in ink.

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Size: 1865px × 1339px
Photo credit: © SBS Eclectic Images / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: mathematics, medicine, science