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Patents for D. P. Cowl
Patents 1 - 5 of 5
First set of recordsLast set of records
NumberDatePatenteeTitleType
125,695Apr. 16, 1872R.S. SanbornImprovement in Wrenchesratchet wrenches
195,993Oct. 09, 1877M.L. EdwardsMetal Drilling Machinedrill presses
216,776Jun. 24, 1879Q.S. BackusBit-stock wrenchesbrace chucks
231,344Aug. 17, 1880J.H. NeedlesCombined apparatus for producing illuminating gas and generating steamstationary boilers
310,774Jan. 13, 1885D.L. BallardReversing Gear for Shaping Machinesmetalworking machine mechanisms
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