US PATENT SUBCLASS 441 / 45
.~.~ Hollow

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

35  DF  RAFTS {8}
44  DF  .~ Columnar flotation member {1}
45.~.~ Hollow {1}
46  DF  .~.~.~> Barrel or drum

DEFINITION

Classification: 441/45

Hollow:

(under subclass 44) Device wherein the buoyancy providing member contains a void.