A cycling valve , reversing valve and actuator mechanism provide {HEAD ~ operator control} of {TAIL ~ the devices} contained in housing  
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A cycling valve , reversing valve and actuator mechanism provide { HEAD ~ operator control } of { TAIL ~ the devices } contained in housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH