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Priority to JP1980086847UpriorityCriticalpatent/JPH0225626Y2/ja
Priority to DE19813120983prioritypatent/DE3120983A1/de
Priority to US06/283,440prioritypatent/US4393778A/en
Publication of JPS5711043UpublicationCriticalpatent/JPS5711043U/ja
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Publication of JPH0225626Y2publicationCriticalpatent/JPH0225626Y2/ja