Electronic calculator with voice clock

Details Electronic calculator with voice clock Electronic calculator with voice clock

1987-10-16

1990-12-11

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Combined

D18 7

Patent

active

D03128318

REFERENCES:
patent: D273200 (1984-03-01), Sakata
patent: D295875 (1988-05-01), Yubisui et al.
patent: D301895 (1989-06-01), Hayashi
patent: 4573134 (1986-02-01), Ikemoto

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