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| Number | Title | Issue Date |
| 6108947 | Bucket dredger Bucket dredger, comprising: a swivelling ladder connected to a vessel, a driven upper wheel at the top end and a polygonal lower wheel (7) at the lower end of the ladder, one or more endless chains (6) which are guided along both wheels, and buckets (9) c... | 08/29/2000 |
