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Priority claimed from CH978872Aexternal-prioritypatent/CH587268A5/de
Priority claimed from CH1872272Aexternal-prioritypatent/CH605987A5/de
Priority claimed from CH265573Aexternal-prioritypatent/CH605988A5/de
Application filedfiledCritical
Publication of PL93779B1publicationCriticalpatent/PL93779B1/pl