| 摘要 |
As a requirement for the opening of a lock or similar security device, an operative group of partially series-interconnected switches is required to be completely series-interconnected, i.e. placed in a closed circuit relation. However, in contrast to a typical prior art electric lock, in which the few switches which operate the lock are grouped, in order to obviate unauthorized detection, with "decoy" switches, the within invention uses all switches in the lock-opening circuit, in that some switches are required to be actuated and the remainder not actuated, or otherwise the circuit cannot be completed. Thus, the security of the lock is significantly improved since unauthorized opening thereof requires not just determining the proper switches to actuate, but also the proper switches which should not be actuated.
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