In 1960, Jorge Díaz Serrano of Mexico was put in touch with Bush by Dresser Industries. Dresser was owned by Prescott Bush's Yale friends Roland and W. Averell Harriman, and had been George H.W. Bush's first employer upon his graduation from Yale, giving him his start in both the oil business and the defense contractor business. Serrano and Bush created a new company, Perforaciones Marinas del Golfo, aka Permargo, in conjunction with Edwin Pauley of Pan American Petroleum, with whom Zapata had a previous offshore contract. The deal with Permargo is not mentioned in Zapata's annual reports, and SEC records are missing. In 1988, a Bush spokesman claimed that the deal lasted only from March to September 1960. However, Zapata sold the oil-drilling rig Nola I to Pemargo in 1964.