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Patents for Mary R. Frost
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,008,181	Nov. 07, 1911	R. Milne	Change-speed mechanism
	1,017,441	Feb. 13, 1912	R. Milne	Gearing
	1,026,595	May 14, 1912	R. Milne	Feeding attachment for drill-spindles

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