US PATENT SUBCLASS 70 / 342
.~.~.~.~ Submaster- and change-key

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.~.~.~.~ Submaster- and change-key {1}
343  DF  .~.~.~.~.~> Change-key shutout

DEFINITION

Classification: 70/342

(under subclass 340) Devices in which a sub-master-key may be provided for each of one or more groups of locking operating mechanisms of a series and for which a master-key may be provided for operating the entire series.