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Patents for William P. Holden
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,223,132	Apr. 17, 1917	W.P. Holden, C.J. Zigler	Lumber Tester
	1,280,354	Oct. 01, 1918	W.P. Holden, C.J. Zigler	Compression Recorder

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