US PATENT SUBCLASS 70 / 341
.~.~.~.~ Change-key shutout

Current as of: June, 1999
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70 /   HD   LOCKS

266  DF  OPERATING MECHANISM {6}
336  DF  .~ Key {10}
337  DF  .~.~ Multiple keys {3}
340  DF  .~.~.~ Master- and change-key {2}
341.~.~.~.~ Change-key shutout

DEFINITION

Classification: 70/341

(under subclass 340) Subject matter wherein there is provision for the shutting out of the change-key under the control of the master-key.