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METHOD OF MAKING A MOISTURE OR WATER RESISTING MATERIAL FOR MIDDLE LAYER OF A CONSTRUCTION UNIT OF HONEYCOMB-TYPE STRUCTURE OF EXPANDED PAPER AND MATERIAL OF SUCH MIDDLE LAYER OBTAINED THEREBY
METHOD OF MAKING A MOISTURE OR WATER RESISTING MATERIAL FOR MIDDLE LAYER OF A CONSTRUCTION UNIT OF HONEYCOMB-TYPE STRUCTURE OF EXPANDED PAPER AND MATERIAL OF SUCH MIDDLE LAYER OBTAINED THEREBY