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Publication date
Priority claimed from NL6910757Aexternal-prioritypatent/NL158359C/xx
Priority claimed from AT502770Aexternal-prioritypatent/AT349811B/de
Application filed by Zweegers P WfiledCriticalZweegers P W
Priority to AT618171ApriorityCriticalpatent/AT335216B/de
Application grantedgrantedCritical
Publication of AT335216BpublicationCriticalpatent/AT335216B/de