Pocket calculator

Details Pocket calculator Pocket calculator

1987-07-27

1990-03-06

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 6

Patent

active

D03064565

REFERENCES:
patent: D248369 (1978-07-01), Robertson et al.
patent: 1839846 (1932-01-01), Greenbaum
patent: 3515264 (1970-06-01), Pittman
patent: 4058208 (1977-11-01), Lund

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