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Patents for David B. Caldwell
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	119,039	Sep. 19, 1871	D.B. Caldwell, J.H. McGowan	Steam Engine
	143,292	Sep. 30, 1873	D.B. Caldwell, J.H. McGowan	Crank-Connection for Steam Engines

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