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Priority to JP15310684UpriorityCriticalpatent/JPH0434559Y2/ja
Publication of JPS6170029UpublicationCriticalpatent/JPS6170029U/ja
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Publication of JPH0434559Y2publicationCriticalpatent/JPH0434559Y2/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