US PATENT SUBCLASS 237 / 10
.~.~ Gas displaced

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

2 R  DF  AUTOMATIC CONTROL {9}
9 R  DF  .~ Steam {3}
10.~.~ Gas displaced

DEFINITION

Classification: 237/10

(under subclass 9) Steam heating systems which displace the steam in the radiators by a gas, such as air or products of combustion.