US PATENT SUBCLASS 122 / 103
.~.~.~ Rear of fire tube

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
*  DD  .~.~ Water tube {4}
103.~.~.~ Rear of fire tube

DEFINITION

Classification: 122/103

(under subclass 51) Devices having water tubes in the rear of the fire tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

89, and 195, for related art.

150, for closely allied art.

153, for horizontal flue boilers with water tubes.