1
Stephen D Flynn: Valve for breathing device. O Two Systems International, George A Rolston, November 18, 1986: US04622964 (161 worldwide citation)

A breathing valve having a valve chamber connectable to a gas supply and to a breathing device, a gas flow opening for exit of exhaled gases through which atmospheric air may be inducted into the chamber, a valve member in the chamber, a one-way flow opening in the valve member through which gas may ...


2
Flynn Stephen D: Soupape pour dispositif daide a la respiration, Valve for breathing device. O Two Systems International, ROLSTON GEORGE A, September 10, 1985: CA1193169

ABSTRACT OF THE DISCLOSURE: A breathing valve having a valve chamberconnectable to a gas supply and to a breathing device,a gas flow opening for exit of exhaled gases throughwhich atmospheric air may be inducted into the chamber,a valve member in the chamber, a one-way flow openingin the valve membe ...