CPC Class Codes
A61M 16/10
Preparation of respiratory ...
A61M 2202/0007
introduced into the body
A61M 2202/0208
Oxygen
A61M 2202/03
Gases in liquid phase, e.g....
F17C 2203/018
by attachment at the neck
F17C 2203/0391
by vacuum
F17C 2203/0629
Two walls
F17C 2203/0636
Metals
F17C 2205/0326
electrically actuated
F17C 2221/011
Oxygen
F17C 2223/0153
Liquefied gas, e.g. LPG, GPL
F17C 2223/033
Small pressure, e.g. for li...
F17C 2225/0123
gaseous, e.g. CNG, GNC
F17C 2227/0304
using an electric heater
F17C 2227/0374
in the liquid
F17C 2227/0393
using a vaporiser
F17C 2270/0189
Planes
F17C 2270/025
Breathing
F17C 9/02
with change of state, e.g. ...
Y10T 137/6606
With electric heating element