US PATENT SUBCLASS 122 / 131
.~.~.~ Internal

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

44.1  DF  FIRE TUBE {11}
114  DF  .~ Vertical {13}
130  DF  .~.~ Water tube {3}
131.~.~.~ Internal

DEFINITION

Classification: 122/131

(under subclass 130) Devices in which the water tubes are within the fire tubes.