Patents for R. G. Dyrenforth


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Patents for R. G. Dyrenforth
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	434,004	Aug. 12, 1890	S.F. Stever	Wrench
	567,966	Sep. 22, 1896	D. Drawbaugh	Substance for telephone-electrodes