US PATENT SUBCLASS 70 / 343
.~.~.~.~.~ 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}
342  DF  .~.~.~.~ Submaster- and change-key {1}
343.~.~.~.~.~ Change-key shutout

DEFINITION

Classification: 70/343

(under subclass 342) Subject matter wherein the change-key may be effectively shut out by control of the operating mechanism by either the particular group sub-master- or the entire series master-key.