providing a positioning device comprising a hoist assembly and {HEAD ~ an electric actuator} having {TAIL ~ a brake assembly} for interacting with the hoist assembly to impede the reduction of the volume of the enclosure, 
having
providing a positioning device comprising a hoist assembly and { HEAD ~ an electric actuator } having { TAIL ~ a brake assembly } for interacting with the hoist assembly to impede the reduction of the volume of the enclosure ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH