| All Patents in class 251/3 |
Patents 1 -
10
of 40
      |
| Picture | Number | Date | Patentee | Title |
| | 1,952,231 | Mar. 27, 1934 | G.V. Anderson | Milling Machine |
| | 1,954,442 | Apr. 10, 1934 | H. Ernst, A.H. Dall | Grinding Machine |
| | 1,978,389 | Oct. 23, 1934 | H. Ernst, B. Sassen | Automatic Pattern Controlled Milling Machine |
| | 1,997,890 | Apr. 16, 1935 | E.L. Wall | Universal Tracer |
| | 2,003,557 | Jun. 04, 1935 | B. Sassen | Hydraulically Controlled Automatic Die Sinking Machine |
| | 2,036,362 | Apr. 07, 1936 | H. Ernst, B. Sassen | Automatic Pattern Controlled Milling Machine |
| | 2,068,889 | Jan. 26, 1937 | E.G. Roehm | Milling and Profiling Machine |
| | 2,083,774 | Jun. 15, 1937 | J.C. Campbell | Sensitive Valve Mechanism |
| | 2,101,712 | Dec. 07, 1937 | E.K. Johansen | Tracer Mechanism for Duplicating Machines |
| | 2,111,332 | Mar. 15, 1938 | E.G. Roehm | Multiple Automatic Pattern Controlled Milling Machine |
