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All Patents in class 408/192
Patents 1 - 13 of 13
First set of recordsLast set of records
52,174Jan. 23, 1866A. Parsons, C.F. KimballImprovement in Bits for Boring Holescountersinks
62,849Mar. 12, 1867T. HofstatterImprovement in Augerscountersinks
63,392Apr. 02, 1867M. JincksImprovement in Boring Bitscountersinks
80,915Aug. 11, 1868L. ColtAugerdrill depth stops
137,373Apr. 01, 1873F. JonasAdjustable Countersink Bit-Assemblycountersinks
178,448Jun. 06, 1876W.H. LaughlinImprovement in Countersinkscountersinks
256,979Apr. 25, 1882J.W. CooperWasher Cutter and Adjustable Bitwasher cutters
326,342Sep. 15, 1885J.C. SmithAdjustable Concentric Channeleradjustable drill bits
458,091Aug. 18, 1891C. BeaucheneExpansion-Bitadjustable drill bits
488,701Dec. 27, 1892T.O. SmithBrace, bit attachment
727,580May 12, 1903G.W. BrackinCountersinkcountersinks
860,488Jul. 16, 1907A. KoontzBoring-Toolcountersinks
1,398,779Nov. 29, 1921L.S. HaydenTool for boring and counterboring wooddrill bits
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