Desk top electronic calculator

Details Desk top electronic calculator Desk top electronic calculator

1979-08-08

1981-10-20

Spangler, Robert C.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02613980

REFERENCES:
patent: D233442 (1974-10-01), Saito
patent: D239836 (1976-05-01), Ikeda
patent: D250430 (1978-11-01), Nishiquchi
patent: D255246 (1980-06-01), Yoshioka et al.
Office Products Apr. 1978 p. 9, calculators.
Evans 1977 catalog p. 170-y, items C and E, calculators.

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