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| All Patents in class 91/522 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,511,821 | Jun. 13, 1950 | E.P. Bullard, III | Control Mechanism | ||
| 3,238,621 | Mar. 08, 1966 | E.P. Bullard, III | Program Control | ||
 | 3,538,813 | Nov. 10, 1970 | T.E. Clyce, J.Y. Cromeens | Remote control system | |