| All Patents in class 74/347 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
 | 103,515 | May 24, 1870 | J. Smith | Improved drilling-machine |
 | 415,439 | Nov. 19, 1889 | E.M. Birdsall | Traction Engine |
| | 451,811 | May 05, 1891 | J.H. Crumb | Traction Engine |
| | 928,894 | Jul. 20, 1909 | J.S. Barnes | Variable-speed gearing |
 | 940,342 | Nov. 16, 1909 | R. Milne | Differential Postive Feed Mechanism |
 | 1,008,182 | Nov. 07, 1911 | R. Milne | Gearing for drill-presses |
 | 1,017,242 | Feb. 13, 1912 | A.B. Browne | Combined Breast Drill and Valve Grinder |
 | 1,045,200 | Nov. 26, 1912 | C.D. Severance | Breast Drill Gearing |
