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All Patents of Type: wood drill bits
Patents 1 - 8 of 8
First set of recordsLast set of records
NumberDatePatenteeTitleType
CA-669Oct. 22, 1870J. LeydenImprovements in expansion drillsdrill bits
567,977Sep. 22, 1896T.F. HagertyCenter Bitwood drill bits
654,861Jul. 31, 1900J.J. TynanBoring Toolwood drill bits
845,360Feb. 26, 1907M. JunglingRecess-boring toolwood drill bits
2,681,673Jun. 22, 1954B.A. MackeyDrill bitwood drill bits
2,752,965Jul. 03, 1956B.A. MackeyDrill bit constructionwood drill bits
2,794,468Jun. 04, 1957R.W. HuxtableWoodcutting bit assemblywood drill bits
4,527,449Jul. 09, 1985W.E. Sydlowski, H.A. TrentBoring bit and method for manufacture thereofwood drill bits
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