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Priority to JP7798280UpriorityCriticalpatent/JPS572267U/ja
Priority to DE3044960Aprioritypatent/DE3044960C2/de
Priority to US06/211,194prioritypatent/US4422421A/en
Priority to GB8038480Aprioritypatent/GB2066353A/en
Publication of JPS572267UpublicationCriticalpatent/JPS572267U/ja