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All Patents in class 408/195
Patents 16 - 30 of 70
First set of recordsPrevious set of recordsNext set of recordsLast set of records
RE3,733Nov. 16, 1869W.A. ClarkImprovement in expansive bitsadjustable drill bits
97,166Nov. 23, 1869H.P. ChapmanImprovement in Extension Bitadjustable drill bits
107,700Sep. 27, 1870P. McCormickImprovement in Washer-Cutterswasher cutters
111,099Jan. 17, 1871B. WalchAdjustable Spur Augeradjustable drill bits
RE4,668Dec. 12, 1871W.A. ClarkImprovement in expansive bitsadjustable drill bits
130,488Aug. 13, 1872R.J. CroacherImprovement in Reamerstapered reamers
131,946Oct. 08, 1872E. FordImprovement in expansive bitsadjustable drill bits
RE5,238Jan. 14, 1873B. WalchImprovement in augersadjustable drill bits
141,324Jul. 29, 1873W.A. ClarkImprovement in Expansive Bitsadjustable drill bits
155,333Sep. 22, 1874W.L. ParmeleeImprovement in expansion-bitsadjustable drill bits
160,015Feb. 23, 1875D. Goodnow, Jr.Improvement in Devices for Cutting out Sheet-Metal Washerswasher cutters
168,607Oct. 11, 1875E. BruleImprovement in Washer-Cutterswasher cutters
170,527Nov. 30, 1875C. CrammerImprovement in Expansible Tools For Cutting Holes of Different Sizesadjustable drill bits
177,982May 30, 1876J.S. AppletonImprovement in Washer-Cutterswasher cutters
209,726Nov. 05, 1878W.F. TiltonImprovement in Devices for Cutting Washerswasher cutters
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