Apparatus 8 wherein {HEAD ~ said locking means} comprises {TAIL ~ a centrifugal lock} operable above a given angular velocity of said sections to effect said locking action 
comprises
Apparatus 8 wherein { HEAD ~ said locking means } comprises { TAIL ~ a centrifugal lock } operable above a given angular velocity of said sections to effect said locking action
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH