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| US4099890 | 17 Dic 1975 | 11 Jul 1978 | Mitsui Mining & Smelting Co., Ltd.
Mitsui Kinzoku Engineering Service Co., Ltd. | Impeller type pump having seal means and protective means |
| US4113407 | 1 Jun 1976 | 12 Sep 1978 | Warman International Limited | High pressure internally lined pump casing |
| US4152096 | 27 Oct 1977 | 1 May 1979 | Mitsui Mining & Smelting Co., Ltd.
Mitsui Kinzoku Engineering Service Co., Ltd. | Pump having seal means and protective means |
| US4264273 | 6 Ago 1979 | 28 Abr 1981 | Warman International Limited | Casing and casing liners for centrifugal pumps of the volute type |
