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All Patents in class 310/25
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	2,240,184	Apr. 29, 1941	C.M. Hathaway	Electric Gauge
	2,428,234	Sep. 30, 1947	A.G. Mapp	Internal Micrometer
	2,622,128	Dec. 16, 1952	P.E. Chapman	Growler type testing device

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