US PATENT SUBCLASS 237 / 58
.~ Steam

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

56  DF  WATER {5}
58.~ Steam

DEFINITION

Classification: 237/58

(under subclass 56) Water heating-systems where the water is heated by steam.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37+, for train steam heaters.

71+, for steam radiators.