The sliding frames are provided for {HEAD ~ movement} at an angle of 120 in {TAIL ~ different directions} perpendicular to the pitch, respectively 
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The sliding frames are provided for { HEAD ~ movement } at an angle of 120 in { TAIL ~ different directions } perpendicular to the pitch , respectively
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH