Combined electronic calculator and clock

Details Combined electronic calculator and clock Combined electronic calculator and clock

1979-08-08

1981-09-15

Spangler, Robert C.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02607778

REFERENCES:
patent: D248994 (1978-08-01), Ikeda
patent: D251330 (1979-03-01), Kurosu et al.
Best Products, 1978 Catalog, p. 358, item D, Combined Clock and Calculator.

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