Electronic calculating machine

Details Electronic calculating machine Electronic calculating machine

1979-10-11

1981-12-01

Spangler, Robert C.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02621401

REFERENCES:
patent: D236353 (1975-08-01), Link
patent: D255245 (1980-06-01), Yoshioka et al.
Evans 1977 Catalog, p. 169-yx, Item P, Calculator.
Evan 1977, Catalog, p. 168-yx, Item B, Calculator.
Best Products 1976 Catalog, p. 350, Item G, Calculator.

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