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All Patents in class 92/12
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	533,290	Jan. 29, 1895	J.D. Gray	Direct-acting steam-engine
	582,092	May 04, 1897	W.H. Ridgway	Air-hoist
	649,357	May 08, 1900	W.H. Ridgway	Hoisting apparatus
	1,205,818	Nov. 21, 1916	E.E. Thomas	Dash-pot
	2,953,122	Sep. 20, 1960	A.I. Zagar	Hydraulic check for air drilling units

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