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 NL6617216ApriorityCriticalpatent/NL6617216A/xx
Priority to DE19671623792prioritypatent/DE1623792A1/de
Priority to GB5547467Aprioritypatent/GB1163169A/en
Publication of NL6617216ApublicationCriticalpatent/NL6617216A/xx