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