The enclosure is mounted removably on the support, by fitting {TAIL ~ its lower face}, intended to receive the gaseous mixture, onto a bearing piece of the support, and the enclosure is autonomous in terms of energy supply and carries {HEAD ~ means} of storing the gases that are intended to form the gaseous mixture 
The enclosure is mounted removably on the support , by fitting { TAIL ~ its lower face } , intended to receive the gaseous mixture , onto a bearing piece of the support , and the enclosure is autonomous in terms of energy supply and carries { HEAD ~ means } of storing the gases that are intended to form the gaseous mixture
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