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All Patents in class 451/497
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	469,226	Feb. 23, 1892	A.P. Boardman	Abrading-cylinder for polishing-machines
	1,887,623	Nov. 15, 1932	C.H. Driver	Surfacing roll
	2,145,980	Feb. 07, 1939	H.O. Schmidt, O.E. Hadwiger	Sandpaper drum

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