US PATENT SUBCLASS 473 / 221
.~.~ With electrical sensor or electrical indicator

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

131  DF  GOLF {23}
219  DF  .~ Practice swingable implement or indicator associated with swingable implement {4}
221.~.~ With electrical sensor or electrical indicator {3}
222  DF  .~.~.~> Sensor positioned apart from implement to interact with a separate cooperating sensor means attachable to or integral with implement
223  DF  .~.~.~> Integral with or attachable to swingable implement {1}
225  DF  .~.~.~> Sensor integral with projectile addressing surface

DEFINITION

Classification: 473/221

With electrical sensor or electrical indicator:

(under subclass 219) Subject matter which includes a device operated by electrical current to detect a condition of the first or second instrument; or to provide a player with information concerning a condition of the first or second instrument.