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| All Patents in class 74/DIG.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,203,743 | Jun. 11, 1940 | F.A. Parsons | Machine Tool Transmission and control | metalworking machine mechanisms | |
| 2,782,891 | Feb. 26, 1957 | B. Sassen | Safety Controls | machine tool controls | |
| 2,928,290 | Mar. 15, 1960 | A.T. Godschalx, E.E. Hosea | Hydraulic Gear Shifting Control | hydraulic apparatus | |
| 4,208,930 | Jun. 24, 1980 | O. Hermann | Spindle Control Mechanism | machine tool controls | |