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All Patents in class 366/122
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	2,148,765	Feb. 28, 1939	A.W. Mall	Mass and form vibrator
	2,167,987	Aug. 01, 1939	A.W. Mall	Vibrator
	2,214,142	Sep. 10, 1940	A.W. Mall	Vibrator
	2,284,090	May 26, 1942	C.F. Hotchkiss, Jr.	Flexible Shafting

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