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 Hanning Bernard W, John Norman DentfiledCriticalHanning Bernard W
Priority claimed from EP83902893Aexternal-prioritypatent/EP0118518B1/de
Application grantedgrantedCritical
Publication of ATE41252T1publicationCriticalpatent/ATE41252T1/de