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Patents for Wilfred W. Roovers
Patents 1 - 5 of 5
First set of recordsLast set of records
NumberDatePatenteeTitleType
372,441Nov. 01, 1887P.G. Williams, W.W. RooversCoin operated induction coil
384,010Jun. 05, 1888W.W. Roovers, P.G. WilliamsCash drawer
RE10,949Jul. 24, 1888W.W. Roovers, P.G. WilliamsCoin Operated Induction Coil
403,978May 28, 1889W.W. Roovers, P.G. WilliamsCoin released spirometer
491,971Feb. 14, 1893W.W. Roovers, P.G. WilliamsCoin controlled dice throwing machine
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