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Patents for John Armstrong
Patents 1 - 7 of 7
First set of recordsLast set of records
PictureNumberDatePatenteeTitle
499,508Jun. 13, 1893W.C. Redfield, J.C. BoothPipe Wrench
  700,865May 27, 1902J. Armstrong, S. WelterCutting Tool
  707,472Aug. 19, 1902J. Armstrong, S. WelterTool Holder
  725,019Apr. 14, 1903J. ArmstrongTool Holder
  745,758Dec. 01, 1903S. Welter, J. ArmstrongSlotting Machine Tool Holder
  779,516Jan. 10, 1905J. ArmstrongProcess of Cuttting Self Hardening Steel
1,155,542Oct. 05, 1915E.B. Bennett, J. ArmstrongCombined Gage and Compass
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