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All Patents in class 91/459
Patents 1 - 7 of 7
First set of recordsLast set of records
255,236Mar. 21, 1882C.E. BallElectric drillhandheld drills
558,749Apr. 21, 1896G.L. ThomasElectrically Controlled Gas Engine or Motorgas and gasoline engines
2,605,751Aug. 05, 1952R.D. Baumgardner, R.D. PerryFluid Pressure Tool Slide Control Assemblymachine tool controls
2,778,342Jan. 22, 1957H.W. RingmanPoppet type valve distributing system for a servo-motor
2,840,956Jul. 01, 1958C.M. GrinageGrinding Machinegrinders
2,951,342Sep. 06, 1960H.E. Boyer, N.V. Gusching, W.H. Ulman, D.E. LundeenElectro-hydraulic servo system
4,790,233Dec. 13, 1988L.W. Durham, B.S. BackeMethod and Apparatus for Controlling Hydraulic Systemsmachine tool controls
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