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All Patents in class 335/272
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	335,787	Feb. 09, 1886	N. Tesla	Electric-Arc Lamp
	422,512	Mar. 04, 1890	R. Eickemeyer	Electro-magnet
	2,494,491	Jan. 10, 1950	O.E. Rosaen	Ironclad Electromagnet with Pivoted Armature

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