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Patents for Hans H. van der Velden
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	2,952,467	Sep. 13, 1960	H.H. van der Velden	Chuck
	3,052,900	Sep. 11, 1962	H.H. van der Velden	Thread Length Control Device for Pipe Threaders

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