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All Patents in class 194/246
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
372,441Nov. 01, 1887W.W. Roovers, P.G. WilliamsCoin operated induction coil
RE10,949Jul. 24, 1888W.W. Roovers, P.G. WilliamsCoin Operated Induction Coil
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