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Patents for W. H. Hartley
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,166,597	Jan. 04, 1916	H.L. Johnston	Grinding and refining mill
	1,264,128	Apr. 23, 1918	T.F. Rataiczak, H.L. Johnston	Mixing-machine

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