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All Patents in class 60/39.23
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	38,866	Jun. 09, 1863	S.H. Roper	Hot Air Engine
	190,490	May 08, 1877	L.P. Martin, J. Hock	Hot Air Engine
	293,185	Feb. 05, 1884	H.S. Maxim	Hot Air or Gas Engine
	403,294	May 14, 1889	J.C. Beckfeld, A. Schmid	Air and Gas Engine

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