US PATENT SUBCLASS 122 / 152
.~.~ Water grate 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}
152.~.~ Water grate in flue

DEFINITION

Classification: 122/152

(under subclass 136) Devices with some form of water grate within the flue.

SEE OR SEARCH THIS CLASS, SUBCLASS:

371+, for structure of water grates.