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U.S. patent office rules that Edison's patent for the incandescent bulb was based on the work of William Sawyer and was invalid.

Date:	08-Oct-1883	Entity:		Country:

Area:	News	Leader:	Thomas Alva Edison	State:

Class:	Management	Resource:		City:

	U.S. patent office rules that Edison's patent for the incandescent bulb was based on the work of William Sawyer and was invalid.