US PATENT SUBCLASS 70 / 142
.~.~.~.~.~ Keeper interlocking

Current as of: June, 1999
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70 /   HD   LOCKS

57  DF  SPECIAL APPLICATION {7}
77  DF  .~ For closures {5}
91  DF  .~.~ Door {5}
101  DF  .~.~.~ Swinging door {4}
141  DF  .~.~.~.~ Locking latch bolts, biased {5}
142.~.~.~.~.~ Keeper interlocking

DEFINITION

Classification: 70/142

(under subclass 141) Subject matter including auxiliary mechanism for securing an interlocking relationship between the effective end of the latching-bolt and its keeper.