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All Patents in class 241/69
Patents 1 - 5 of 5
Number	Date	Patentee	Title	Type
285,391	Sep. 25, 1883	J.C. Butterfield	Mortar for stamp-mills	ore processing apparatus
312,956	Feb. 24, 1885	H. Bolthoff	Stamp-mill
687,024	Nov. 19, 1901	N. Heid	Machine for grinding wood or like materials	wood grinding machines
1,726,435	Aug. 27, 1929	F.J. Haller	Comminuting machine
1,954,613	Apr. 10, 1934	F.A. Breeze	Cutting mechanism	grist mills

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