All Patents in class 416/220R


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All Patents in class 416/220R
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	142,820	Sep. 16, 1873	S. Miller, H.K. Stevens	Improvement in screw-propellers
	1,229,490	Jun. 12, 1917	R.C. Allen, W.J. London	Turbine