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| All Patents in class 91/216A | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,295,161 | Sep. 08, 1942 | H.C. Clay | Hydraulic Control Mechanism | hydraulic machinery | |
| 2,383,429 | Aug. 21, 1945 | G.A. Wahlmark | Hydraulically operated control mechanism | ||
| 2,516,495 | Jul. 25, 1950 | A.P. Waterson | Hydraulic tool control unit | metal lathe accessories and attachments | |
| 2,636,579 | Apr. 28, 1953 | M. De Haas | Tailstock Spindle Clamping Device | metal lathe mechanisms | |
| 2,737,073 | Mar. 06, 1956 | M. De Haas | Tailstock Actuating Device | metal lathe mechanisms | |