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All Patents in class 425/DIG.218
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,100,984	Jun. 23, 1914	W. Murchey	Screw-cutting tap
	1,361,400	Dec. 07, 1920	R.B. Tewksbury, H.W. Oster	Diestock

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