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All Patents in class 172/41
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	2,214,142	Sep. 10, 1940	A.W. Mall	Vibrator
	2,774,292	Dec. 18, 1956	E. Hartmann	Earth conditioning device
	2,897,902	Aug. 04, 1959	A.N. Emmons	Power operated orbital motion tool

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