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| Number | Title | Issue Date |
| 3931134 | Process and apparatus for the separating out of coarse and/or heavy particles from a variable particle size and/or variable particle weight mixture of granular solids maintained in a vortex state Elutriation apparatus and process using apparatus comprising an upper and a lower member separated by a restricted intermediate cross-section member wherein the lower member has a lesser cross section than the upper member. The process is carried out by o... | 01/06/1976 |
