| http://www.w3.org/ns/prov#value | - According to a still further preferred structure, the device has a first oxygen or gaseous inlet valve which includes an operating member, and the operating member comprises mounting means, e.g., a button, slidable axially in a valve seating member, the first inlet valve comprising a ball valve and the mounting means or button including an extension for lifting the ball valve off its seating on mo
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