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.)
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Application filedfiledCritical
Priority to NL6704730ApriorityCriticalpatent/NL6704730A/xx
Priority to BE712757Dprioritypatent/BE712757A/xx
Priority to CH449868Aprioritypatent/CH472958A/fr
Priority to FR1557547Dprioritypatent/FR1557547A/fr
Priority to DE1968N0021346prioritypatent/DE1988384U/de
Publication of NL6704730ApublicationCriticalpatent/NL6704730A/xx