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All Patents in class 470/87
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	115,451	May 30, 1871	J.N. Durrell	Improvement in machines for tapping nuts
	142,511	Sep. 02, 1873	S.W. Putnam, Jr.	Improvement in machines for tapping nuts
	432,522	Jul. 22, 1890	G.J. Forrey	Nut Machine
	1,127,754	Feb. 09, 1915	J.J. Grant	Nut-machine

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