All Patents in class 91/477


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All Patents in class 91/477
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	46,470	Feb. 21, 1865	W.C. Hicks	Improvement in steam-engines
	1,893,825	Jan. 10, 1933	H. Ernst	Hydraulic Transformer
	1,998,004	Apr. 16, 1935	H. Ernst	Differential Hydraulic Speed Gear
	2,010,378	Aug. 06, 1935	B. Sassen	Hydraulic Power Unit
	2,492,688	Dec. 27, 1949	A.H. Dall	Hydraulic Power Unit