Addometer adding machine with 8 stylus-operated dials, made by the Reliable Typewriter and Adding Machine Co., Chicago, in case with instruction sheet.
Addometer adding machine c.1925 with instruction sheet. Made by the Reliable Typewriter and Adding Machine Company of Chicago, USA, the Addometer was a popular adding machine based on Blaise Pascal's (1623-1662) design of 250 years earlier.
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