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| Number | Title | Issue Date |
| 4836695 | Composite sliding surface bearing A composite sliding surface bearing consisting of a backing layer of steel, a bearing alloy layer which consists of aluminum and has been applied to said backing layer, and a sliding surface layer which consists of zinc phosphate and has been deposited on... | 06/06/1989 |
| 4451232 | Nozzle block for rotary kilns In order to reduce the wear and to facilitate the replacement, a nozzle block comprises a mounting plate which is connected to the kiln shell, a nozzle tube which extends in the mounting tube and defines a clearance with the mounting tube and with the kil... | 05/29/1984 |
