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
Priority claimed from NL7017081Aexternal-prioritypatent/NL7017081A/xx
Application filed by P W ZweegersfiledCriticalP W Zweegers
Publication of DK137661BpublicationCriticalpatent/DK137661B/da
Application grantedgrantedCritical
Publication of DK137661CpublicationCriticalpatent/DK137661C/da