Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Post OfficefiledCriticalPost Office
Priority claimed from EP19890311712external-prioritypatent/EP0427893B1/de
Application grantedgrantedCritical
Publication of ATE93484T1publicationCriticalpatent/ATE93484T1/de