All Patents in class 137/628


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All Patents in class 137/628
Patents 1 - 4 of 4
Number	Date	Patentee	Title	Type
113,517	Apr. 11, 1871	B. Holly	Safety Valve	steam safety valves
2,151,658	Mar. 21, 1939	B.E. Folke	Injector	water injectors
2,360,695	Oct. 17, 1944	R.H. McClellan, C.E. Linden	Hydraulic gear shifting and driving system	radial drill presses
2,612,184	Sep. 30, 1952	W.I. Evans	Sensitive Hydraulic Tracer Valve	hydraulic apparatus