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Patents for Frederick M. Wirtz
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	429,553	Jun. 03, 1890	F.M. Wirtz, J. Wirtz	Wrench
	451,792	May 05, 1891	J. Wirtz, F.M. Wirtz	Wrench

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