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49311-Urban and suburban passenger railway transportation by underground, metro and similar systems
| Title | Company | Company Number | Date filed | Status | Publication number |
|---|---|---|---|---|---|
| Monitoring track condition | London Underground Limited | 01900907 | 1995-09-26 | Terminated | GB2305796 |
| Improvements in or relating to doors | London Underground Limited | 01900907 | 1992-11-27 | Granted | GB2274092 |
| Improved adaptive audio systems | Docklands Light Railway Limited;Trim, Richard Morris | 02052677 | 1995-10-06 | Terminated | GB2306086 |
| Controlling audio level in dependence on ambient noise | Docklands Light Railway Limited;Gilden Research Ltd | 02052677 | 1994-05-04 | Ceased | GB2289583 |
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