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 filedfiledCritical
Priority to BE662523ApriorityCriticalpatent/BE662523A/xx
Publication of BE662523ApublicationCriticalpatent/BE662523A/xx
Priority to DE19661553538prioritypatent/DE1553538A1/de
