US PATENT SUBCLASS 237 / 9 B
.~.~ With direct contact between products of combustion and the liquid to be vaporized

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

2 R  DF  AUTOMATIC CONTROL {9}
9 R  DF  .~ Steam {3}
9 B.~.~ With direct contact between products of combustion and the liquid to be vaporized

Unofficial Alpha Subclasses: R A B

DEFINITION

Classification: 237/9

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

6, for car heaters.

7, for combined heater and boiler.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids,

535+, and 549+, for heaters peculiar to Class 34 apparatus.