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All Patents in class 336/30
Patents 1 - 4 of 4
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
	2,937,577	May 24, 1960	J.M. Morgan, Jr.	Tracing Apparatus
	3,079,548	Feb. 26, 1963	K.A. Robinson	Electromechanical Signalling Apparatus

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