| Patents for Harold J. Siekmann |
Patents 1 -
15
of 64
      |
| 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 | metalworking machine mechanisms |
| 1,993,995 | Mar. 12, 1935 | H.J. Siekmann, W.F. Groene | Orbital Lathe | metalworking 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 | W.F. Groene, H.J. Siekmann | Crankshaft Chuck | metal lathe chucks |
| 2,124,348 | Jul. 19, 1938 | H.J. Siekmann, R.M. Bacon, W.F. Groene | Hydraulic Lathe Transmission | metalworking machine mechanisms |
| 2,148,326 | Feb. 21, 1939 | H.J. Siekmann | Combined Clutch and Brake Device | metalworking machine mechanisms |
| 2,148,348 | Feb. 21, 1939 | W.F. Groene, H.J. Siekmann | Turret lathe | turret lathes |
| 2,148,349 | Feb. 21, 1939 | H.J. Siekmann, W.F. Groene | Orbital Lathe Feed Mechanism | metalworking machine mechanisms |
| 2,156,153 | Apr. 25, 1939 | W.R. Meyer, H.J. Siekmann, W.F. Groene | Multiple Spindle Vertical Crankshaft Lathe | crankshaft lathes |
| 2,191,347 | Feb. 20, 1940 | W.F. Groene, H.J. Siekmann | Crankshaft lathe | crankshaft lathes |
| 2,192,436 | Mar. 05, 1940 | W.F. Groene, H.J. Siekmann | Center drive double end turret lathe | turret lathes |
| 2,192,437 | Mar. 05, 1940 | W.F. Groene, H.J. Siekmann | Spindle control mechanism | metal lathes |
| 2,221,049 | Nov. 12, 1940 | H.J. Siekmann, W.F. Groene | Work Loading Mechanism for Lathes | crankshaft lathes |
