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| All Patents in class 60/420 | |||||
| Picture | Number | Date | Patentee | Title | |
| 1,999,834 | Apr. 30, 1935 | H. Ernst | Multiple Hydraulic Motor Operation | ||
| 3,757,641 | Sep. 11, 1973 | J.R. Goff | Control system for synchronizing movement of driven machine members | ||