{HEAD ~ The positioning device} 60 further comprises {TAIL ~ an electric motor} 68 being mounted onto the support structure 62 and for engagement with the pulley assembly 64 
comprises
{ HEAD ~ The positioning device } 60 further comprises { TAIL ~ an electric motor } 68 being mounted onto the support structure 62 and for engagement with the pulley assembly 64
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH