Electronic calculator with electronic musical instrument and tim

Details Electronic calculator with electronic musical instrument and tim Electronic calculator with electronic musical instrument and tim

1981-06-22

1983-06-14

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Combined

D10 2, D17 1, D18 7, D1002, D1701, D1801

Patent

active

D02693534

REFERENCES:
patent: D202555 (1965-10-01), Meunier
patent: D232836 (1974-09-01), Kitai
patent: D243701 (1977-03-01), Ikeda
patent: D258068 (1981-01-01), Ostrom
patent: D263969 (1982-04-01), Hirata et al.
patent: D264729 (1982-06-01), Kobayashi

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