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Patents for Joseph Insull
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	480,739	Aug. 16, 1892	H.F. Parshall	Commutator for electro-magnetic machines
	480,740	Aug. 16, 1892	H.F. Parshall	Armature for dynamo-electric machines

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