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| US4148248 | 20 Dec 1976 | 10 Apr 1979 | Maxton Manufacturing Company | Hydraulic valve control system |
| US4153074 | 18 Oct 1976 | 8 May 1979 | Maxton Manufacturing Company | Hydraulic valve |
| US4321435 | 1 Sep 1977 | 23 Mar 1982 | Siemens Aktiengesellschaft | Fluid actuating device for an electric circuit breaker |
