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MATERIAL SAFETY DATA SHEET <br /> )P4 PRODUCT <br /> NALCO , <br /> Emergency Telephone Number <br /> Medical (312) 920-1510(24 hours)* <br /> NALCO CHEMICAL COMPANY ONE NALCO CENTER • NARERVILLE. ILLINOIS 60566-1024 <br /> AREA 3 9 2-9r=1-9-900° 'Effective November 11. 1989. the area code will be changed to 708. <br />