US PATENT SUBCLASS 237 / 6
.~.~ Steam

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

2 R  DF  AUTOMATIC CONTROL {9}
5  DF  .~ Car {1}
6.~.~ Steam

DEFINITION

Classification: 237/6

(under subclass 5) Automatic control for steam heating apparatus.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, especially

22, for automatic control, per se.