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Patents for Charles F. Hilker
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	684,432	Oct. 15, 1901	H.R. Isler	Engine Lathe
	684,433	Oct. 15, 1901	H.R. Isler	Differential Speed Mechanism
	704,645	Jul. 15, 1902	H.R. Isler	Differential Speed Mechanism

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