the telescopic actuator converts {HEAD ~ a rotation} of a rotating shaft of a motor into expansion and contraction movements of an output rod via the planetary reduction gear and {TAIL ~ the screw feed mechanism} 
via
the telescopic actuator converts { HEAD ~ a rotation } of a rotating shaft of a motor into expansion and contraction movements of an output rod via the planetary reduction gear and { TAIL ~ the screw feed mechanism }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL