Apparatus for automatic inflation of a diver flotation device in response to cessation of breathing by the diver, or in response to pressure reduction of the air source to a predetermined reserve pressure. The apparatus includes high and low pressure systems, the low pressure system being coupled to...http://www.google.com/patents/US4176418?utm_source=gb-gplus-sharePatent US4176418 - Apparatus for automatic inflation of diver flotation means
