US PATENT SUBCLASS 237 / 8 R
.~ Water

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

2 R  DF  AUTOMATIC CONTROL {9}
8 R.~ Water {4}
8 A  DF  .~.~> Automatic heating systems (water) with controls
8 B  DF  .~.~> Heating systems with high temperature boiling liquids
8 C  DF  .~.~> With boiler by-pass valve control
8 D  DF  .~.~> Compact heating systems with controls

Unofficial Alpha Subclasses: R A B C D

DEFINITION

Classification: 237/8

(under subclass 2) Automatic control of water heating systems.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4, for incubator heaters.

5, for car heaters.

7, for combined heater and boiler.