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| All Patents in class 91/44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,393,918 | Jan. 29, 1946 | R.H. McClellan, C.E. Linden | Hydraulic operating and control mechanism | radial drill presses | |
| 2,671,294 | Mar. 09, 1954 | E.S. Cornell | Hydraulically Driven Machine Tool | surface grinders | |
| 3,003,472 | Oct. 10, 1961 | D.C. Miller, R.M. Ferris | Quill Actuating and Clamping Mechanism | milling machines | |
| 3,176,590 | Apr. 06, 1965 | A.H. Dall, H.R. Uhtenwoldt | Clamping Device | metalworking machine mechanisms | |