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All Patents in class 72/371
Patents 1 - 7 of 7
First set of recordsLast set of records
6,305Apr. 10, 1849N.C. Sanford, L.B. SmithMachine for regulating the twist and diameter of screw-augerstool making machines
13,780Nov. 13, 1855R. CookDies for Making Cook's Bitsmaking drills and augers
75,182Mar. 03, 1868J. MixImprovement in Manufacturing Gimletsmaking drills and augers
189,265Apr. 03, 1877J.C. RichardsonImprovement in Gimlets and Twist-Drillsmaking drills and augers
208,862Oct. 08, 1878J. SwanImprovement in the Manufacture of Auger-Bitsmaking drills and augers
341,084May 04, 1886F.E. WhitneyManufacture of Twist-Drillsmaking drills and augers
392,119Oct. 30, 1888M. HardsocgMethod of Twisting Augersmaking drills and augers
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