Electronic desk calculator with blackboard display

Details Electronic desk calculator with blackboard display Electronic desk calculator with blackboard display

1976-01-29

1977-07-12

Burke, Wallace R.

Printing and office machinery

Printing equipment

Hand held or manipulated

D1801

Patent

active

D02450240

REFERENCES:
patent: D235022 (1975-04-01), Kovacs
patent: D235209 (1975-05-01), Baughman
patent: D235349 (1975-06-01), Kurozumi
Sears Christmas Catalog, 1973, p. 495, Cookie Monster.

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