| 摘要 |
A valve control mechanism is provided which is particularly well suited to be used in conjunction with an hydraulically operated machine tool, such as a milling machine, lathe, or similar machine. A tracer mechanism actuates the valve which in turn hydraulically controls the movement of the machine tool. The disclosure is particularly concerned with such a valve control mechanism which incorporates a booster servo system for facilitating the operation of the mechanism and thus lightening the contact pressure of the stylus of the tracer mechanism on the guiding template.
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