US PATENT SUBCLASS 70 / 92
.~.~.~ Emergency exit

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}
92.~.~.~ Emergency exit

DEFINITION

Classification: 70/92

(under subclass 91) Devices, for doors in which the locking construction is capable of preventing ingress except by proper key or combination control but wherein the securing mechanism may be readily released from the inside of the building.