发明授权
US09589402B2 Restricted area access control system 有权
限制区门禁系统

Restricted area access control system
摘要:
An access control system controls access to a restricted area. A mobile device exchanges messages with a backend server to validate a user and to control an actuator for a physical barrier responsive to validation. Beacon-based unique identifiers are calculated at validation time for the current location to facilitate the validation.
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