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Priority to JP10096581UpriorityCriticalpatent/JPS585720U/ja
Publication of JPS585720UpublicationCriticalpatent/JPS585720U/ja
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Publication of JPS6139550Y2publicationCriticalpatent/JPS6139550Y2/ja
Method for manufacturing elements of expanded synthetic material having layers of particularly high strength and apparatus for implementing said method, and products obtained thereby