US PATENT SUBCLASS 237 / 68
.~ Air discharge
Current as of: June, 1999
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DEFINITION
Classification: 237/68
(under subclass 67) Steam heating systems with special means for removing the incondensable gases in the system.
SEE OR SEARCH CLASS
137, Fluid Handling,
197+, for discriminating outlets for gas (gas vents which do not pass liquid).
236, Automatic Temperature and Humidity Regulation, for thermal valves.
417, Pumps, for pumps, per se.
