US PATENT SUBCLASS 70 / 337
.~.~ Multiple keys

Current as of: June, 1999
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70 /   HD   LOCKS

266  DF  OPERATING MECHANISM {6}
336  DF  .~ Key {10}
337.~.~ Multiple keys {3}
338  DF  .~.~.~> Selective shutout type
339  DF  .~.~.~> Interdependent
340  DF  .~.~.~> Master- and change-key {2}

DEFINITION

Classification: 70/337

(under subclass 336) Subject matter requiring a plurality of keys for successful operation of the operating mechanism.

SEE OR SEARCH THIS CLASS, SUBCLASS:

262+, for systems of locking mechanisms designed for cooperative utility.