| 摘要 |
A plurality of cylinder and piston assemblies for connection on their inlet sides to respective fluid sources and on their outlet sides to a common vessel, the cylinder-and-piston assemblies each including valve means operable to communicate a selected side of the respective piston with one of the associated supply fluid and common vessel, and communicate the other piston side with the other of the supply fluid and common vessel, the valve means being interconnected for operation in predetermined relation.
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