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All Patents in class 235/143
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,172,793	Feb. 22, 1916	O.D. Hapgood	Revolution Counter
	2,129,979	Sep. 13, 1938	G.L. Storm, C. Westervelt, A. Kaufmann	Measuring Device

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