| Patents for Harold J. Siekmann |
Patents 1 -
10
of 64
      |
| Picture | Number | Date | Patentee | Title |
| | 1,744,885 | Jan. 28, 1930 | H.J. Siekmann, W.F. Groene | Machine Tool |
| | RE18,662 | Nov. 22, 1932 | H.J. Siekmann, W.F. Groene | Machine Tool |
| | 1,993,994 | Mar. 12, 1935 | H.J. Siekmann, W.F. Groene | Orbital Lathe |
| | 1,993,995 | Mar. 12, 1935 | W.F. Groene, H.J. Siekmann | Orbital Lathe |
| | 2,110,266 | Mar. 08, 1938 | H.J. Siekmann, W.F. Groene | Crankshaft Lathe |
| | 2,113,509 | Apr. 05, 1938 | H.J. Siekmann, W.F. Groene | Crankshaft Chuck |
| | 2,124,348 | Jul. 19, 1938 | H.J. Siekmann, R.M. Bacon, W.F. Groene | Hydraulic Lathe Transmission |
| | 2,148,326 | Feb. 21, 1939 | H.J. Siekmann | Combined Clutch and Brake Device |
 | 2,148,348 | Feb. 21, 1939 | W.F. Groene, H.J. Siekmann | Turret lathe |
| | 2,148,349 | Feb. 21, 1939 | H.J. Siekmann, W.F. Groene | Orbital Lathe Feed Mechanism |
