US PATENT SUBCLASS 237 / 61
.~.~ Auxiliary boiler

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

56  DF  WATER {5}
59  DF  .~ Circulation {4}
61.~.~ Auxiliary boiler

DEFINITION

Classification: 237/61

(under subclass 59) Subject matter having an auxiliary boiler for aiding the circulation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37+, for train steam boiler combinations.