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

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