All Patents in class 138/145


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All Patents in class 138/145
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	67,080	Jul. 23, 1867	N. Stephens	Improved tap for cement-lined pipes
	97,767	Dec. 14, 1869	J.W. Douglas	Improvement in pumps
	127,438	Jun. 04, 1872	A.P. Stephens	Improvement in the manufacture of cement pipes
	319,144	Jun. 02, 1885	N. Stephens, M.L. Ritchie	Method of utilizing old boiler-tubes