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