Electronic calculator

Details Electronic calculator Electronic calculator

1974-08-26

1976-12-14

Burke, Wallace R.

Lighting

Light source

Electric light bulb

D1801

Patent

active

D02427214

REFERENCES:
patent: D227472 (1973-06-01), Hikawa
patent: D227472 (1973-06-01), Yamamoto et al.
patent: D230484 (1974-02-01), Yamagami
patent: D233347 (1974-10-01), Beitler et al.

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