{TAIL ~ A method} 1, characterized in {HEAD ~ that said other periodic movement} has a frequency other than that of the rotating movement 
{ TAIL ~ A method } 1 , characterized in { HEAD ~ that said other periodic movement } has a frequency other than that of the rotating movement
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH