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