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Priority to JP1980008010UpriorityCriticalpatent/JPS6328480Y2/ja
Publication of JPS56110499UpublicationCriticalpatent/JPS56110499U/ja
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Publication of JPS6328480Y2publicationCriticalpatent/JPS6328480Y2/ja
Sound transmission material, sound control plane structure including building use using the sound transmission material, windscreen for microphone, protective grille, sound transmission projection screen, and speaker