US PATENT SUBCLASS 122 / 154
.~.~.~ Over bridge wall

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
153  DF  .~.~ Water tube {1}
154.~.~.~ Over bridge wall

DEFINITION

Classification: 122/154

(under subclass 153) Devices in which the water tubes extend over the bridge wall in the flue.

SEE OR SEARCH THIS CLASS, SUBCLASS:

77, 102, 104, 105, and 108, for related structure.

141, for closely allied art in the horizontal flue type of boiler.