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Patents for Knut R. Sjogren
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,789,601	Jan. 20, 1931	K.R. Sjogren	Chuck
	2,293,176	Aug. 18, 1942	K.R. Sjogren	Collet chuck construction
	2,311,258	Feb. 16, 1943	K.R. Sjogren	Collet chuck

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