METHOD AND APPARATUS FOR OPERATING AN ACTUATOR
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United States of America Patent
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Issued Date -
Oct 18, 2007
app pub date -
Apr 5, 2007
filing date -
Apr 6, 2006
priority date (Note) -
Abandoned
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Abstract
A drilling or flushing medium is used in the operation of an actuator for controlling an earth working device which uses the drilling or flushing medium for its operation as well. The actuator is acted upon by the medium , which can be retained in the actuator through suitable operation of a valve assembly, while at the same time can be supplied to the earth working device to execute a desired function. The valve assembly is hereby actuated by a separate switch.
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