All Patents in class 178/92


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All Patents in class 178/92
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	4,453	Apr. 11, 1846	S.F. Morse	Improvement in electro-magnetic telegraphs
	5,568	May 16, 1848	C.F. Johnson	Improvement in electric telegraphs