US PATENT SUBCLASS 110 / 123
.~.~ Draft regulator

Current as of: June, 1999
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110 /   HD   FURNACES

119  DF  SPARK ARRESTERS {3}
122  DF  .~ Smokebox {7}
123.~.~ Draft regulator

DEFINITION

Classification: 110/123

(under subclass 122) Subject matter including also draft regulation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

126, for devices including regulation of vertical drum type.