US PATENT SUBCLASS 122 / 269
.~.~ Plural fire tube

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

235.11  DF  WATER TUBE {52}
266  DF  .~ Internal fire tube {5}
269.~.~ Plural fire tube

DEFINITION

Classification: 122/269

(under subclass 266) Devices whose water tubes have a plurality of fire tubes within them.