Electronic calculator

Details Electronic calculator Electronic calculator

1990-02-01

1992-07-21

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 6, D14100

Patent

active

D03280918

REFERENCES:
patent: D256695 (1980-09-01), Yamagami
patent: D282853 (1986-03-01), Yoshioka et al.
patent: D297547 (1988-09-01), Sasaki
patent: D308536 (1990-06-01), Suzuki
patent: D314004 (1991-01-01), Ida
patent: D314206 (1991-01-01), Ido
patent: 4697072 (1987-09-01), Kawana

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