US PATENT SUBCLASS 473 / FOR 179
.~.~ Adjustable tension (273/73E)

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

FOR 168  DF  BAT, MALLET, RACKET, OR BILLY (273/67R) {23}
FOR 171  DF  .~ Tennis (273/73R) {14}
FOR 179.~.~ Adjustable tension (273/73E)