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Priority claimed from US298506Aexternal-prioritypatent/US3872017A/en
Priority claimed from US298595Aexternal-prioritypatent/US3872005A/en
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Publication of JPS4881348ApublicationCriticalpatent/JPS4881348A/ja
Publication of JPS55113B2publicationCriticalpatent/JPS55113B2/ja