Bud Frazier, of the Texas Heart Institute, likes to tell the story of William Hall, who worked in 1964 with Domingo Liotta on an artificial heart.

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However, it was young, valiant San Franciscan engineer, William Hammond Hall, who took on the 20-year project.

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Northern Ireland Secretary Peter Mandelson and the Lord Lieutenant of County Down, William J Hall, were among the guests who welcomed the Queen and the Duke of Edinburgh to the province.

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