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All Patents of Type: drill bit extensions
Patents 1 - 15 of 23
First set of recordsNext set of recordsLast set of records
116,090Jun. 20, 1871W.S. PattinImprovement in Extension-Shanks for Boring-Bitsdrill bit extensions
162,874May 04, 1875W. WellsAuger-Bit Extensiondrill bit extensions
281,568Jul. 17, 1883C. SchochExtension-Shank for Bitsdrill bit extensions
315,079Apr. 07, 1885I.P. ShottsExtension-Shank for Bits, &c.drill bit extensions
455,477Jul. 07, 1891J.F. StewardDrill Bit Extension, Etc.drill bit extensions
698,001Apr. 22, 1902B.F. FossLengthening Attachment for Bitsdrill bit extensions
759,042May 03, 1904W.B. SwanBit-Extenderdrill bit extensions
810,230Jan. 16, 1906W.B. SwanBit-Extenderdrill bit extensions
854,742May 28, 1907C.E. HillAdjustable extension bit holderdrill bit extensions
890,894Jun. 16, 1908G.W. Leonard, W.H. EhrhartBit-Extenderdrill bit extensions
899,203Sep. 22, 1908F.E. CarlsonBit Extensiondrill bit extensions
929,231Jul. 27, 1909J.A. LelandBit Extensiondrill bit extensions
954,046Apr. 05, 1910W.A. PeckExtension bit-holderdrill bit extensions
1,030,592Jun. 25, 1912J.A. LelandTelescopic Extension-Roddrill bit extensions
1,241,143Sep. 25, 1917H.E. ParkerBit Brace Extensiondrill bit extensions
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