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| Number | Title | Issue Date |
| 4402834 | Method for dewatering sludge-type material A process of dewatering sludge in which raw sludge and a flocculating agent are first mixed by suitable means, then fed into a rotary filter drum or similar device to effect thickening of the sludge and partial dewatering thereof. The now thickened sludge... | 09/06/1983 |
| 4192743 | Process of dewatering sludge-type material and installation for carrying out the process There is disclosed a process of dewatering sludge and other materials of that kind. The process provides that the raw sludge and a flocculating agent are first mixed by suitable means, then fed into a rotary filter drum or similar device to effect thicken... | 03/11/1980 |
| 3979296 | Filter A filter consisting of two endless belts of filter material having runs pressed together, of means pressing a run of one belt against the adjacent run of the other, and of a feed device for introducing the slurry between the runs.... | 09/07/1976 |
