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All Patents in class 408/194
Patents 1 - 15 of 31
First set of recordsNext set of recordsLast set of records
9,398Nov. 16, 1852C.L. BarnesExpanding bitadjustable drill bits
10,872May 02, 1854A. WeeksExpansion-bitadjustable drill bits
17,038Apr. 14, 1857A. HallExpansive bitadjustable drill bits
20,192May 11, 1858W.A. ClarkMethod of seating the movable cutter in expansive bitsadjustable drill bits
21,597Sep. 28, 1858W.A. ClarkExpansive bitadjustable drill bits
22,195Nov. 30, 1858M. NorrisAuger for woodadjustable drill bits
RE3,516Jun. 22, 1869W.A. ClarkImprovement in expansive bitsadjustable drill bits
RE3,733Nov. 16, 1869W.A. ClarkImprovement in expansive bitsadjustable drill bits
RE4,668Dec. 12, 1871W.A. ClarkImprovement in expansive bitsadjustable drill bits
131,946Oct. 08, 1872E. FordImprovement in expansive bitsadjustable drill bits
269,406Dec. 19, 1882P.A. GladwinAugeradjustable drill bits
313,735Mar. 10, 1885G.H. HillExpansible bitadjustable drill bits
360,990Apr. 12, 1887C.E. BillingsExpansive bitadjustable drill bits
415,988Nov. 26, 1889W.S. WhitingExtension-bitadjustable drill bits
458,091Aug. 18, 1891C. BeaucheneExpansion-Bitadjustable drill bits
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