US PATENT SUBCLASS 4 / 508
.~.~.~ And water level control

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

488  DF  POOL TYPE {9}
506  DF  .~ Construction details {2}
507  DF  .~.~ Including water inlet or outlet means {3}
508.~.~.~ And water level control

DEFINITION

Classification: 4/508

And water level control:

(under subclass 507) Subject matter including means to keep the water at a certain height.