US PATENT SUBCLASS 122 / 135.2
.~ Alternative stack

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

135.1  DF  FLUE {4}
135.2.~ Alternative stack

DEFINITION

Classification: 122/135.2

Alternative stack:

(under subclass 135.1) Devices having a substitute flue or fire tube.