Electronic calculating machine

Details Electronic calculating machine Electronic calculating machine

1975-07-16

1977-04-05

Burke, Wallace R.

Printing and office machinery

Printing equipment

Hand held or manipulated

D1801

Patent

active

D02439581

REFERENCES:
patent: D222542 (1971-11-01), Matsumoto
patent: D226485 (1973-03-01), Kitai
patent: D228291 (1973-09-01), Maeda et al.
patent: D235349 (1975-06-01), Kurozumi
patent: D237195 (1975-10-01), Kitai

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