Electronic calculator

Details Electronic calculator Electronic calculator

1986-10-10

1990-07-31

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03096246

REFERENCES:
patent: D235209 (1975-05-01), Baughman
patent: D245108 (1977-07-01), Pemberton
patent: D247522 (1978-03-01), Woithe
patent: D273303 (1984-04-01), Sakamoto
patent: D273593 (1984-04-01), Sakamoto
patent: D297947 (1988-10-01), Yubisui
Best Catalog, 1985/86, p. 307, #16, Gr. 290, Library.

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