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All Patents in class 74/18.2
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,533,281	Apr. 14, 1925	H.E. Tautz	Testing machine
	1,661,131	Feb. 28, 1928	G.B. Duffield	Expansible Collapsible Element
	2,154,651	Apr. 18, 1939	O.P. Wodack, H.M. Zschau	Tool retainer for portable power driven tools

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