| 摘要 |
The ram attitude system of U.S. Pat. No. 3,349,669 of Oct. 31, 1967 is made less critical as to adjustments by incorporating a novel valve assembly for each of the two pumps, the valve assembly associated with the pump supplying the leading hydraulic motor, causing a continuously increasing by-pass of said hydraulic motor with deviation of the ram of a machine, to set up corresponding corrective forces in a non-proportional manner but with no sharp changes in such corrective forces.
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