{HEAD ~ The object} of the present invention is to provide {TAIL ~ a helicopter rotor} of the above described type which will be substantially free from such disadvantage 
is to provide
{ HEAD ~ The object } of the present invention is to provide { TAIL ~ a helicopter rotor } of the above described type which will be substantially free from such disadvantage
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH