US PATENT SUBCLASS 70 / 420
.~.~.~.~ Guard ward

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}
420.~.~.~.~ Guard ward

DEFINITION

Classification: 70/420

(under subclass 419) Devices including fixed means which is usally in the form of an additional unconventional impediment to the operation of the locking mechanism.