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Patents for John Armstrong
Patents 1 - 7 of 7
First set of recordsLast set of records
NumberDatePatenteeTitleType
499,508Jun. 13, 1893W.C. Redfield, J.C. BoothPipe Wrenchchain and strap wrenches
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 Compasstrammels
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