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