US PATENT SUBCLASS 473 / 151
.~.~ Electrical sensor or electrical indicator responsive to swingable implement or projectile

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

131  DF  GOLF {23}
150  DF  .~ Projectile addressing surface and target, or distance marker (e.g., course, putting green with cup, driving range, miniature golf course, etc.) {7}
151.~.~ Electrical sensor or electrical indicator responsive to swingable implement or projectile {1}
152  DF  .~.~.~> Sensor is projectile responsive (e.g., free-flight detection means, etc.) {3}

DEFINITION

Classification: 473/151

Electrical sensor or electrical indicator responsive to swingable implement or projectile:

(under subclass 150) Subject matter including means operated by electrical current to detect a condition of an instrument to be swung by the player or to detect a condition of an object to be struck by the instrument; or to provide a player with information concerning a condition of the instrument or condition of the object.