| All Patents in class 76/2 |
Patents 1 -
10
of 16
      |
| Picture | Number | Date | Patentee | Title |
 | 851 | Jul. 24, 1838 | R.N. Watrous, E. L'Hommedieu | Machinery for manufacturing double-twist screw-augers |
 | RE72 | Jul. 30, 1845 | E. L'Hommedieu | Improvement in machinery for manufacturing double-twist screw-augers |
 | 56,869 | Jul. 31, 1866 | R. Jennings | Improvements in Machinery for Swaging the Heads of Screw Augers |
 | 76,955 | Apr. 21, 1868 | J. Swan | Improved Machine for Making Auger-Bits |
 | 78,769 | Jun. 09, 1868 | J. Swan | Machine for Upsetting Cook's Bits |
 | 100,816 | Mar. 15, 1870 | J. Swan | Machine for Upsetting Cook's Bits |
 | 116,509 | Jun. 27, 1871 | J. Swan | Improvement in machines for forming lips of auger-bits |
 | RE4,516 | Aug. 15, 1871 | J. Swan | Machine for Upsetting Cook's Bits |
 | RE4,517 | Aug. 15, 1871 | J. Swan | Machine for Upsetting Cook's Bits |
 | RE4,569 | Sep. 26, 1871 | J. Swan | Improvement in Machinery for Forming the Lips of Augers |
