US PATENT SUBCLASS 285 / 148.24
.~.~.~.~ Sheet-metal (e.g., stove duct, etc.)

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

144.1  DF  SERIAL,RELATIVELY MOVABLE PORTIONS {4}
148.1  DF  .~ Serial diverse single flow path or line {10}
148.22  DF  .~.~ Diverse size or shape {2}
148.23  DF  .~.~.~ Reducer {3}
148.24.~.~.~.~ Sheet-metal (e.g., stove duct, etc.)

DEFINITION

Classification: 285/148.24

Sheet-metal (e.g., stove duct, etc.):

(under subclass 148.23) Subject matter wherein the lines are very thin-walled.