US PATENT SUBCLASS 70 / 421
.~.~.~.~ Guard tumbler

Current as of: June, 1999
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70 /   HD   LOCKS

266  DF  OPERATING MECHANISM {6}
336  DF  .~ Key {10}
416  DF  .~.~ Tampering prevention or attack defeating {6}
419  DF  .~.~.~ Anti-pick {2}
421.~.~.~.~ Guard tumbler

DEFINITION

Classification: 70/421

(under subclass 419) Devices including means which is usually in the form of an unconventional movable impediment in addition to the usual tumbler mechanism.