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Patents for Frederick Ayres Johnson
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	597,418	Jan. 18, 1898	F.A. Johnson	Regulation of dynamo-electric machinery
	597,419	Jan. 18, 1898	F.A. Johnson	Regulation of dynamo-electric machinery
	CA-66,038	Jan. 31, 1900	F.A. Johnson	Dynamo electric machine

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