US PATENT SUBCLASS 70 / 339
.~.~.~ Interdependent

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}
339.~.~.~ Interdependent

DEFINITION

Classification: 70/339

(under subclass 337) Devices in which the concurrent or simultaneous employment of two or more keys to effect release is necessary.