(under the class definition) Device (1) comprising a closure which is defined as made of frangible or easily broken material which is destroyed to gain access through the closed passage, or (2) wherein the closure is retained in closed position by a defined means which must be deformed or destroyed or which requires an excessive amount of force to release the closure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
44+, for a plural winged closure with means to permit the wings to collapse for emergency exit.
139+, for a closure moved by a motor and having means providing for emergency manual operations; e.g., in the event of motor failure.
SEE OR SEARCH CLASS
70, Locks,
92, for door locks having emergency release means. 105, Railway Rolling Stock,
348+, for emergency exits for railway passenger cars.
