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Robert Steinbock-Sinclair, 77, of Oak Brook, a lawyer and international businessman, died Friday in Loyola University Medical Center in Maywood. He was a former vice president of W.R. Grace & Co. in New York. He was a native of Poland and a graduate of the University of London and John Marshall Law School. He is survived by his wife, Margaret; two daughters, Margarita and Marygrace; two sons, James and Terrence; a sister; a brother; and a grandson. Visitation will be from 2 to 9 p.m. Sunday in Hursen Funeral Home, Roosevelt and Mannheim Roads, Hillside. Services will be at 10 a.m. Monday in St. Isaac Jogues Catholic Church, 306 W. 4th St., Hinsdale.