An anesthetic respiratory system which is switchable between half-open and half-closed modes of operation improved with respect to the conspicuousness and operational safety. A CO.sub.2 absorber is arranged in an expiration branch and is formed as a switching element detachable from connection points...http://www.google.es/patents/US4552141?utm_source=gb-gplus-sharePatente US4552141 - Anesthetic respiratory system
