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All Patents in class 408/194
Patents 16 - 30 of 32
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NumberDatePatenteeTitleType
476,614Jun. 07, 1892H.O. DavisAdjustable Bitadjustable drill bits
509,667Nov. 28, 1893J.P. LavigneExpansible Bitadjustable drill bits
525,386Sep. 04, 1894E. FordExpansible bitadjustable drill bits
624,439May 09, 1899A.L. AdamsExpansion-Bitadjustable drill bits
661,554Nov. 13, 1900J.E. RobertsRotary Cutter Headdrill bits
662,199Nov. 20, 1900J.P. LavigneExpansible Bitadjustable drill bits
722,481Mar. 10, 1903J.C. BeyerExtension Boring-Bitadjustable drill bits
803,223Oct. 31, 1905T.F. GaynorExpansion-Augeradjustable drill bits
818,062Apr. 17, 1906S.H. TuckerExpansible bitadjustable drill bits
825,479Jul. 10, 1906J.T. ParkerAdjustable Bit Attachmentdrill accessories
848,632Apr. 02, 1907G.T. ChafinBitadjustable drill bits
884,111Apr. 07, 1908O. TackBoring-Tooladjustable drill bits
931,593Aug. 17, 1909L.W. GarnerExpansible Boring-Bitadjustable drill bits
963,468Jul. 05, 1910E. PastoreExpansible Bitadjustable drill bits
970,789Sep. 20, 1910G.P. ButlerExpansible Bitadjustable drill bits
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