| All Patents in class 76/108.6 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
 | 6,305 | Apr. 10, 1849 | N.C. Sanford, L.B. Smith | Machine for regulating the twist and diameter of screw-augers |
 | 8,032 | Apr. 08, 1851 | H. Strait | Saw-set |
 | 10,744 | Apr. 04, 1854 | A. Pease | Drill for metal gun-barrels |
 | 189,265 | Apr. 03, 1877 | J.C. Richardson | Improvement in Gimlets and Twist-Drills |
| | 240,984 | May 03, 1881 | T.P. Farmer | Art of Manufacturing Twist Drills |
 | 341,084 | May 04, 1886 | F.E. Whitney | Manufacture of Twist-Drills |
 | 392,119 | Oct. 30, 1888 | M. Hardsocg | Method of Twisting Augers |
| | 432,636 | Jul. 22, 1890 | S. Moore | Machine for Straightening and Sizing Twist Drills |
| | 1,285,589 | Nov. 26, 1918 | H.L. Barnes | Method of Making Drills |
 | 2,129,417 | Sep. 06, 1938 | C.G. Gase | End mill |
