Auto calculator

Details Auto calculator Auto calculator

1988-07-21

1990-12-25

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03132439

REFERENCES:
patent: D238788 (1976-02-01), Goldsamt
patent: D274179 (1984-06-01), Siwula
patent: D302336 (1989-07-01), Erickson
patent: D303540 (1989-09-01), Lewis
patent: 2892266 (1959-06-01), Tomkins
patent: 3932859 (1976-01-01), Kyriakides et al.
patent: 4257306 (1981-03-01), Laflamme
patent: 4875164 (1989-10-01), Monfort

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