US PATENT SUBCLASS 114 / 333
.~.~.~ Water ballast

Current as of: June, 1999
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114 /   HD   SHIPS

312  DF  SUBMERSIBLE DEVICE {15}
330  DF  .~ Having attitude control {1}
331  DF  .~.~ Depth control {2}
333.~.~.~ Water ballast

DEFINITION

Classification: 114/333

Water ballast:

(under subclass 331) Device wherein said means controls the intake or expulsion of water from a holding tank.