{HEAD ~ The device} 6, wherein {TAIL ~ the means} of detecting rotation parameters comprises a sensor secured to the non rotating ring and an encoder secured to the rotating ring 
wherein
{ HEAD ~ The device } 6 , wherein { TAIL ~ the means } of detecting rotation parameters comprises a sensor secured to the non rotating ring and an encoder secured to the rotating ring
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH