Calculator case

Details Calculator case Calculator case

1987-10-13

1990-07-31

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 7

Patent

active

D03096297

REFERENCES:
patent: D223832 (1972-06-01), Penny
patent: D227473 (1973-06-01), Lampel
patent: D265208 (1982-06-01), Faranda et al.

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