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Application filedfiledCritical
Priority to DD181850ApriorityCriticalpatent/DD117338A1/xx
Priority to NO753012Aprioritypatent/NO140403C/no
Priority to SU7502180000Aprioritypatent/SU567429A1/ru
Priority to SE7511625Aprioritypatent/SE419283B/xx
Publication of DD117338A1publicationCriticalpatent/DD117338A1/xx