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 Heldman Chemie G M B HfiledCriticalHeldman Chemie G M B H
Priority to BE609348ApriorityCriticalpatent/BE609348A/en
Publication of BE609348ApublicationCriticalpatent/BE609348A/en