Manual calculator

Details Manual calculator Manual calculator

1996-04-30

1997-09-16

Veynar, Caron D.

Printing and office machinery

Typewriter or calculator

Calculator

1801

Patent

active

D03837742

REFERENCES:
patent: D224259 (1972-07-01), Raimondi
patent: 3091389 (1963-05-01), Wiken
patent: 4028529 (1977-06-01), Van De Weghe
patent: 4149330 (1979-04-01), Huff
patent: 4308450 (1981-12-01), Ausman et al.

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