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| All Patents in class 60/451 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,996,466 | Apr. 02, 1935 | H. Ernst | Pressure Responsive Hydraulic Feed Control Mechanism | ||
| 2,888,806 | Jun. 02, 1959 | K.A. Teumer | Control system | ||
 | 3,429,123 | Feb. 25, 1969 | R.K. Burroughs | Speed control system | |