US PATENT SUBCLASS 122 / 166.2
.~.~.~ Loop-type tube

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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
166.1  DF  .~.~ With internal water tube {12}
166.2.~.~.~ Loop-type tube

DEFINITION

Classification: 122/166.2

Loop-type tube:

(under subclass 166.1) Devices wherein the water tube is folded back and joined at the ends.