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| All Patents in class 269/227 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,209,379 | Jul. 30, 1940 | M.A. Bell | Clamping device | clamps | |
| 2,328,061 | Aug. 31, 1943 | F.W. Curtis | Hydraulic Vise | milling machine accessories | |
| 2,370,351 | Feb. 27, 1945 | E.F. Hohwart | Clamping fixture | work holding | |
| 2,544,966 | Mar. 13, 1951 | R.E. Schulz | Hydraulically operated chuck | crankshaft lathes | |
| 2,818,002 | Dec. 31, 1957 | O.W. Barker, J.J. Lenert | Transfer Machines | milling machines | |
| 3,073,589 | Jan. 15, 1963 | G. Hohwart | Work clamping fixture | work holding | |