US PATENT SUBCLASS 122 / 409
.~.~ Horizontal flue boiler

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

406.1  DF  CIRCULATION {7}
408.1  DF  .~ Having internal conduit {2}
409.~.~ Horizontal flue boiler {1}
410  DF  .~.~.~> Return fire tube

DEFINITION

Classification: 122/409

(under subclass 408) Devices comprising horizontal large flue boilers.