All Patents in class 277/528


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All Patents in class 277/528
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
124,182	Feb. 27, 1872	H.C. White	Improvement in Piston Rod Packing	piston ring and packing
490,107	Jan. 17, 1893	R.G. Ferguson	Packing	auxiliary wrenches