All Patents in class 266/249


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All Patents in class 266/249
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	65,946	Jun. 18, 1867	C. Richardson	Improved Apparatus for Tempering Steel Plates
	150,289	Apr. 28, 1874	W. Clemson	Improvement in apparatus for tempering saws
	1,253,966	Jan. 15, 1918	F.W. Harris	Process and Apparatus for Treating Drill Pipe