US PATENT SUBCLASS 237 / 74
.~.~ Circuit

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

70  DF  HEAT RADIATORS {6}
73  DF  .~ Steam {2}
74.~.~ Circuit

DEFINITION

Classification: 237/74

(under subclass 73) Steam-heated radiators having injecting means for causing a continued circulation of steam through or around within the radiator or for injecting air into the radiator or for circulating water therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72, for means to inject steam into the water.