As best shown in FIGS 4 and 5, {TAIL ~ the interior} 22 of system housing 11 contains a compressor 23, a controller 24, a position sensor 25 and batteries 26 and 27 to supply electrical power to {HEAD ~ the compressor} 23 
As best shown in FIGS 4 and 5 , { TAIL ~ the interior } 22 of system housing 11 contains a compressor 23 , a controller 24 , a position sensor 25 and batteries 26 and 27 to supply electrical power to { HEAD ~ the compressor } 23
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