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| Number | Title | Issue Date |
| 5428906 | Sludge treatment system A method of converting industrial, domestic or other sludge, into a pelletized or granular fertilizer, as well as a sludge converter for practicing the method. The sludge is dewatered to form sludge cake solids which are dried in a dryer, and then sorted ... | 07/04/1995 |
| 5279637 | Sludge treatment system A method of converting industrial, domestic or other sludge, into a pelletized or granular fertilizer, as well as a sludge converter for practicing the method. The sludge is dewatered to form sludge cake solids which are dried in a dryer, and then sorted ... | 01/18/1994 |
