{TAIL ~ a control device} for enabling the apparatus to displace in an automatic way from {HEAD ~ a rest position} to the checking condition, and vice versa 
{ TAIL ~ a control device } for enabling the apparatus to displace in an automatic way from { HEAD ~ a rest position } to the checking condition , and vice versa
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH