US PATENT SUBCLASS 441 / 29
.~.~.~ Variable ballast

Current as of: June, 1999
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441 /   HD   BUOYS, RAFTS, AND AQUATIC DEVICES

1  DF  BUOY {6}
21  DF  .~ Having means to control attitude or position {3}
28  DF  .~.~ Having ballast means {1}
29.~.~.~ Variable ballast

DEFINITION

Classification: 441/29

Variable ballast:

(under subclass 28) Buoy wherein the ratio of heavy material to buoyancy producing agent may be varied.