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Patents for John Martin Barr
Patents 1 - 3 of 3
First set of recordsLast set of records
PictureNumberDatePatenteeTitle
1,079,629Nov. 25, 1913J.M. BarrResistance-ring of rotors
  1,216,397Feb. 20, 1917B.F. Bailey, J.M. Barr, O.S. More, L.G. LongInduction Motor
  1,285,589Nov. 26, 1918H.L. BarnesMethod of Making Drills
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