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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 Holdermetal planer tool holders
725,019Apr. 14, 1903J. ArmstrongTool Holderlathe tool holders and tool posts
745,758Dec. 01, 1903S. Welter, J. ArmstrongSlotting Machine Tool Holderslotting machine tool holders
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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