| 摘要 |
An electronic security system is provided for use in large institutions, such as hotels. A particular room is assigned a data-bearing room access device, (which may physically resemble a key), chosen at random from a group of such devices, the device bearing coded information which is entered and stored in a control unit at a memory location previously assigned to that room number. Until this information is removed from the memory, access to the room cannot be obtained except through the use of a device containing the required information, and further, attempted unauthorized access will cause an alarm signal to be activated.
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