Multipurpose desk top calculator

Details Multipurpose desk top calculator Multipurpose desk top calculator

1989-10-23

1991-08-13

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D03190692

REFERENCES:
patent: D256924 (1980-09-01), Ohie et al.
patent: D258889 (1981-04-01), Hayashi
patent: D269614 (1983-07-01), Murphy
patent: D269780 (1983-07-01), Doodson
patent: D307588 (1990-05-01), Barker et al.
patent: D313012 (1990-12-01), Pataki et al.
patent: 4375584 (1983-03-01), Muzumdar et al.
patent: 4498787 (1985-02-01), Jung-Sun
patent: 4573134 (1986-02-01), Ikemoto
patent: 4769796 (1988-09-01), Levine

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