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
Priority claimed from DE3230753Aexternal-prioritypatent/DE3230753C1/en
Application filed by Hartwig Michels, Knud KlinglerfiledCriticalHartwig Michels
Application grantedgrantedCritical
Publication of ATE20027T1publicationCriticalpatent/ATE20027T1/en