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| All Patents in class 60/453 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,006,312 | Jun. 25, 1935 | B. Sassen, H. Ernst | Compensating Bleeder Valve | hydraulic apparatus | |
| 2,037,262 | Apr. 14, 1936 | F.A. Parsons | Transmission Mechanism | milling machines | |
| 2,474,706 | Jun. 28, 1949 | G.A. Wahlmark | Hydraulic transmission | ||
| 3,429,123 | Feb. 25, 1969 | R.K. Burroughs | Speed control system | hydraulic apparatus | |