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Patent US491992 - CUT-OUT FOR INCANDESCENT ELECTRIC LAMPS
CUT-OUT FOR INCANDESCENT ELECTRIC LAMPS
THOMAS A. EDISON
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Patent number
: 491992
Issue date
: Feb 21, 1893
Inventor
:
THOMAS A. EDISON
Current U.S. Classification
:
315/75
;
200/82.00R
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Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US7832900
Jul 10, 2008
Nov 16, 2010
Lightbulb with envelope-fracture responsive electrical disconnect means
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