All Patents in class 285/417


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All Patents in class 285/417
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	174,177	Feb. 29, 1876	H. Albrecht	Improvement in shaft-couplings
	319,144	Jun. 02, 1885	N. Stephens, M.L. Ritchie	Method of utilizing old boiler-tubes