US PATENT SUBCLASS 122 / 140.2
.~.~.~ Having water tube in flue

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
140.1  DF  .~.~ Internal water tube {7}
140.2.~.~.~ Having water tube in flue

DEFINITION

Classification: 122/140.2

Having water tube in flue:

(under subclass 140.1) Devices wherein the water tube is in the flue.