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