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METHOD OF MAKING FOAMED* WATERRPROOF BUILDING MATERIAL BY BURNING GYPSUM OBTAINED FROM PROCESS OF SMOKE DESUFURIZATION* MAKING CALCINED GYPSUM POWDER AND ADDING THERETO FOAMINGGAGENT AND WATERRREPELLI
METHOD OF MAKING FOAMED* WATERRPROOF BUILDING MATERIAL BY BURNING GYPSUM OBTAINED FROM PROCESS OF SMOKE DESUFURIZATION* MAKING CALCINED GYPSUM POWDER AND ADDING THERETO FOAMINGGAGENT AND WATERRREPELLI