US PATENT SUBCLASS 122 / 108
.~.~.~ Subjacent water 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}
106  DF  .~.~ Water wall {2}
108.~.~.~ Subjacent water tube

DEFINITION

Classification: 122/108

(under subclass 106) Devices having some form of water tubes between the walls in the combustion chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

135+, for closely allied structure.