Hold-up prevention system and device reversing the result of the threat of death by the aiming of a weapon at a human being

摘要

The present addition to the main patent consists of a device which automatically imparts to the hook 4 of the main invention a blocking in this open position and which can be released manually after the opening of the door. This addition also adds an automatic alarm and display system which is seen from outside the protected space, as soon as the system, by obeying the programmer, has changed to the lock-releasing position.