US PATENT SUBCLASS 473 / 375
.~.~.~.~ Hollow core

Current as of: June, 1999
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473 /   HD   GAMES USING TANGIBLE PROJECTILE

131  DF  GOLF {23}
351  DF  .~ Ball {8}
371  DF  .~.~ Particular unitary or layered construction {3}
374  DF  .~.~.~ Diverse layer between spherical core and cover {2}
375.~.~.~.~ Hollow core

DEFINITION

Classification: 473/375

Hollow core:

(under subclass 374) Subject matter wherein the innermost spherical portion is devoid of any liquid or solid material.