US PATENT SUBCLASS 122 / 410
.~.~.~ Return fire tube

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  DF  .~.~ Horizontal flue boiler {1}
410.~.~.~ Return fire tube

DEFINITION

Classification: 122/410

(under subclass 409) Devices having return fire tubes.