Electronic calculator

Details Electronic calculator Electronic calculator

1976-04-02

1977-10-11

Burke, Wallace R.

Printing and office machinery

Printing equipment

Hand held or manipulated

D1801

Patent

active

D02460688

REFERENCES:
patent: D228291 (1973-09-01), Maeda et al.
patent: D238493 (1976-01-01), Mageda
patent: D240737 (1976-07-01), McCain et al.
patent: 3887791 (1975-06-01), Kitchens

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