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| Number | Title | Issue Date |
| 4975905 | Message transmission control arrangement for node in local area network A local area network for interconnecting terminals and other users and data processing systems and other service providers over a communications link. The users and providers connect to the communications link by means of interface units each of which may... | 12/04/1990 |
| 4975904 | Local area network for digital data processing system including timer-regulated message transfer arrangement A local area network for interconnecting terminals and other users and data processing systems and other service providers over a communications link by means of interface units each of which may connect to several users or providers. The interface units ... | 12/04/1990 |
