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Priority claimed from DE3806949Aexternal-prioritypatent/DE3806949A1/de
Priority claimed from DE3806948Aexternal-prioritypatent/DE3806948A1/de
Application filed by Philips Nv, Siemens AgfiledCriticalPhilips Nv
Priority claimed from EP89902742Aexternal-prioritypatent/EP0395739B1/de
Application grantedgrantedCritical
Publication of ATE92692T1publicationCriticalpatent/ATE92692T1/de