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| All Patents in class 60/471 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,286,880 | Jun. 16, 1942 | W.A. Traut | Hydraulic Control System | ||
| 2,448,675 | Sep. 07, 1948 | P.L. Loewe | Control mechanism for a plurality of motors | ||
| 2,473,507 | Jun. 21, 1949 | E.P. Bullard | Positioning Apparatus | ||