b) closing means for urging said door between said first open position ad second closed position having a housing and comprising a cable having one end fixed securely to the frame containing said door and the other end of said cable fixed securely to {TAIL ~ a rotating reel} contained in said housing, said cable wound about periphery of {HEAD ~ said reel} 
b ) closing means for urging said door between said first open position ad second closed position having a housing and comprising a cable having one end fixed securely to the frame containing said door and the other end of said cable fixed securely to { TAIL ~ a rotating reel } contained in said housing , said cable wound about periphery of { HEAD ~ said reel }
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