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| Number | Title | Issue Date |
| 6172606 | Network security An alarm or monitoring system for a computer network in which network devices are able to be "locked" onto the network, in which condition an alarm is raised if the device is removed. This occurs even when the device is switched off, as the monitoring of ... | 01/09/2001 |
| 5161192 | Repeaters for secure local area networks A multiport repeater for a local area network installation has (in addition to its conventional functions) means for storing access rules for the items of equipment connected to it. It reads a portion of each frame, which may be all or part of the destina... | 11/03/1992 |
