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All Patents in class 470/203
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	415,846	Nov. 26, 1889	F.H. Richards	Screw Tapping Machine
	635,324	Oct. 24, 1899	R. Kilburn	Tap for Forming Screw Threads
	1,320,660	Nov. 04, 1919	H.W. Thompson	Lathe Chuck
	1,391,639	Sep. 20, 1921	V.R. Koontz	Collapsible tap
	1,983,189	Dec. 04, 1934	A.J. Prance	Thread cutting tool

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