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Alarm Capability for Pin Tumbler Locks.
DEPARTMENT OF THE NAVY WASHINGTON DC
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Fiber optic sensors are used at one or more of the top pin and spring assemblies in a pin tumbler lock to sense either authorized or unauthorized attempt to open the lock. A fiber optic switching element, in a simple capsule form, can be installed in new or existing locks. Fiber optic circuitry signals surreptitious attempts to open the lock. Patents
APPROVED FOR PUBLIC RELEASE