US PATENT SUBCLASS 473 / FOR 142
.~.~ Methods of pressurizing (273/61D)

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473 /   HD   GAMES USING TANGIBLE PROJECTILE

FOR 134  DF  BALLS (273/58R) {14}
FOR 138  DD  .~ Tennis (273/61R) {4}
FOR 142.~.~ Methods of pressurizing (273/61D)