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 Filterwerk Mann & Hummel G. M. B. H.filedCriticalFilterwerk Mann & Hummel G. M. B. H.
Application grantedgrantedCritical
Publication of DK68884CpublicationCriticalpatent/DK68884C/da