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All Patents in class 418/77
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
251,733	Jan. 03, 1882	W.C. Pooley	Rotary engine	rotary steam engines
347,242	Aug. 10, 1886	J. Hills	Rotary Steam Engine	rotary steam engines
2,492,687	Dec. 27, 1949	A.H. Dall	Hydraulic Pump	hydraulic apparatus

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