Lighting – Light source – Electric light bulb
Patent
1988-06-10
1990-12-25
Lucas, Susan J.
Lighting
Light source
Electric light bulb
Patent
active
D03132811
REFERENCES:
patent: D219516 (1970-12-01), Venema
patent: D261812 (1981-11-01), Bowles et al.
patent: 1798745 (1931-03-01), Lyman
patent: 2116722 (1938-05-01), Downer
Holten Petrus A. J.
Joosten Stefanus F. W.
Lucas Susan J.
U.S. Philips Corporation
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