CPC Main Group A62B 7/00 Respiratory apparatus (for medical purposes A61M16/00) 6 direct subcodes Child Classifications Navigate with arrow keys, Enter to open A62B 7/02 with compressed oxygen or air A62B 7/06 with liquid oxygen A62B 7/08 containing chemicals producing oxygen A62B 7/10 with filter elements A62B 7/12 with fresh-air hose A62B 7/14 for high-altitude aircraft