| Patents for Harold J. Siekmann |
Patents 1 -
15
of 50
      |
| Number | Date | Patentee | Title | Type |
| 1,744,885 | Jan. 28, 1930 | H.J. Siekmann, W.F. Groene | Machine Tool | machine tool controls |
| RE18,662 | Nov. 22, 1932 | H.J. Siekmann, W.F. Groene | Machine Tool | machine tool controls |
| 1,993,994 | Mar. 12, 1935 | H.J. Siekmann, W.F. Groene | Orbital Lathe | machine mechanisms |
| 1,993,995 | Mar. 12, 1935 | H.J. Siekmann, W.F. Groene | Orbital Lathe | machine mechanisms |
| 2,110,266 | Mar. 08, 1938 | H.J. Siekmann, W.F. Groene | Crankshaft Lathe | metal lathe chucks |
| 2,113,509 | Apr. 05, 1938 | H.J. Siekmann, W.F. Groene | Crankshaft Chuck | metal lathe chucks |
| 2,124,348 | Jul. 19, 1938 | R.M. Bacon, W.F. Groene, H.J. Siekmann | Hydraulic Lathe Transmission | machine mechanisms |
| 2,148,326 | Feb. 21, 1939 | H.J. Siekmann | Combined Clutch and Brake Device | machine mechanisms |
| 2,148,349 | Feb. 21, 1939 | H.J. Siekmann, W.F. Groene | Orbital Lathe Feed Mechanism | machine mechanisms |
| 2,156,153 | Apr. 25, 1939 | W.R. Meyer, H.J. Siekmann, W.F. Groene | Multiple Spindle Vertical Crankshaft Lathe | crankshaft lathes |
| 2,221,049 | Nov. 12, 1940 | H.J. Siekmann, W.F. Groene | Work Loading Mechanism for Lathes | crankshaft lathes |
| 2,232,226 | Feb. 18, 1941 | W.R. Meyer, H.J. Siekmann, W.F. Groene | Crankshaft Lathe | metal lathe chucks |
| 2,232,324 | Feb. 18, 1941 | H.J. Siekmann, W.F. Groene | Orbital Lathe | machine mechanisms |
| 2,264,458 | Dec. 02, 1941 | H.J. Siekmann | Vertical Crank Pin Lathe | crank pin lathes |
| 2,267,696 | Dec. 23, 1941 | H.J. Siekmann, W.F. Groene | Blacklash Eliminator for Orbital Lathes | machine mechanisms |
