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All Patents in class 188/312
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	9,689X	Jun. 02, 1836	S. Cram	Hydrostatic and pneumatic breaker
	2,574,751	Nov. 13, 1951	V.R. Noll	Engine for producing reciprocatory motion having substantially constant velocity except during reversals

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