US PATENT SUBCLASS 4 / 219
.~ Sewer

Current as of: June, 1999
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4 /   HD   BATHS, CLOSETS, SINKS, AND SPITTOONS

209 R  DF  VENTILATION {10}
219.~ Sewer {2}
220  DF  .~.~> Disinfecting
221  DF  .~.~> Burner

DEFINITION

Classification: 4/219

Means for ventilating sewers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

211, for house systems.