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Priority to JP1987144267UpriorityCriticalpatent/JPS6449355U/ja
Priority to DE3831938Aprioritypatent/DE3831938A1/de
Priority to US07/247,129prioritypatent/US4860818A/en
Priority to KR1019880012227Aprioritypatent/KR910006944B1/ko
Publication of JPS6449355UpublicationCriticalpatent/JPS6449355U/ja