The Duke unveiled a plaque at the ceremony which also saw the company's production manager Martin Austin presented with a long service award.
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Jones, 73, who received a long service award, was part of the Wales squad that took part in the 1958 World Cup in Sweden.
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They were recognised by the City of Bristol in 2011 with a long service award to celebrate 30 years of dedicated work in fostering.
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Smith had been with the club for over 20 years, and the statement paid tribute to his "long and loyal" service and skills, saying he had won a prestigious groundsman of the year award in 2007.
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