| All Patents in class 408/212 |
Patents 1 -
10
of 56
      |
| Picture | Number | Date | Patentee | Title |
 | 13,261 | Jul. 17, 1855 | L.H. Gibbs | Expanding auger or bit |
 | 20,192 | May 11, 1858 | W.A. Clark | Method of seating the movable cutter in expansive bits |
 | 22,474 | Dec. 28, 1858 | H. Stone | Expanding bit |
 | 27,946 | Apr. 17, 1860 | J. Blake | Auger |
 | 29,793 | Aug. 28, 1860 | W.A. Ives | Single-Spur Double-Twist Auger Bit |
 | 29,883 | Sep. 04, 1860 | J.M. Hathaway | Adjustable Auger |
 | 47,946 | May 30, 1865 | C.L. Griswold | Improvement in Augers |
 | 52,056 | Jan. 16, 1866 | E.G. Lamson | Improvement in Augers |
 | 55,132 | May 29, 1866 | S.L. Lyford | Improvement in Gages for Augers |
 | RE3,879 | Mar. 15, 1870 | I.T. Payne | Improvement in Augers |
