US PATENT SUBCLASS 122 / 155.4
.~.~ Having corrugated flue

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}
155.4.~.~ Having corrugated flue

DEFINITION

Classification: 122/155.4

Having corrugated flue:

(under subclass 155.1) Devices where the flue has parallel and alternating ridges and grooves.