US PATENT SUBCLASS 122 / 130
.~.~ Water tube

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.~.~ Water tube {3}
131  DF  .~.~.~> Internal
132  DF  .~.~.~> Radial loop
133  DF  .~.~.~> Spur

DEFINITION

Classification: 122/130

(under subclass 114) Devices having some form of water tubes, not otherwise provided for.

SEE OR SEARCH THIS CLASS, SUBCLASS:

166+, for vertical flue boilers with water tubes in the flues.