US PATENT SUBCLASS 74 / *
.~.~.~.~ Progressive

Current as of: June, 1999
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74 /   HD   MACHINE ELEMENT OR MECHANISM

640  DF  GEARING {31}
325  DF  .~ Interchangeably locked {11}
*  DD  .~.~ Slidable keys or clutches {3}
*  DD  .~.~.~ Single clutch shaft {3}
*.~.~.~.~ Progressive {2}
362  DF  .~.~.~.~.~> Multiple key {1}
366  DF  .~.~.~.~.~> Single key {2}