All Patents in class 173/144


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All Patents in class 173/144
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	91,117	Jun. 08, 1869	N.B. Hadley	Improvement in machines for threading screws
	1,272,345	Jul. 09, 1918	J. Beaudry	Drilling Machine