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| Number | Title | Issue Date |
| 4555781 | Conversational video system having local network control A video conversational data communication network (30) in which subscribers (34, 36) may conduct conversational video textual data communications with one or more keystations (70, 602, 98) in the network (30). Each keystation (70, 602, 98) is associated w... | 11/26/1985 |
| 4525779 | Conversational video system A video conversational data communication network (30) in which subscribers (34, 36) may conduct conversational video textual data communications with one or more keystations (70, 602,98) in the network (30). Each keystation (70, 602, 98) is associated wi... | 06/25/1985 |
