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Patents for Frank E. Hartley
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
381,968May 01, 1888N. TeslaElectro-magnetic motorinduction motors
381,969May 01, 1888N. TeslaElectro-magnetic motorinduction motors
408,565Aug. 06, 1889G.D. WoodworthCigar Box Openercombination tools
416,194Dec. 03, 1889N. TeslaElectric Motor
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