The disadvantages of operation "rigidity" found in automatic breathing apparatus according to the prior art are overcome by means of a regulator group made in a number of versions and capable of adjusting, moment by moment, according to the surrounding pressure or depth, the percentage of breathing gases...http://www.google.fr/patents/US5368020?utm_source=gb-gplus-shareBrevet US5368020 - Automatic breathing apparatus for underwater immersion at medium and great depth
Automatic breathing apparatus for underwater immersion at medium and great depth
