US PATENT SUBCLASS 473 / 228
.~.~.~ Air resistance device (e.g., airfoil, etc.)

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}
226  DF  .~.~ Device attachable to or integral with swingable implement {6}
228.~.~.~ Air resistance device (e.g., airfoil, etc.)

DEFINITION

Classification: 473/228

Air resistance device (e.g., airfoil etc.):

(under subclass 226) Subject matter wherein the structure comprises a part which reacts in opposition against the atmosphere when the instrument is swung.