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William Arthur Williams (29 December 1905 – 4 November 1973) was a Welsh dual-code international rugby union, and professional rugby league footballer who played in the 1920s and 1930s. He played representative level rugby union (RU) for Wales, and at club level for Crumlin and Cross Keys as a flanker, and representative level rugby league (RL) for Great Britain and Wales, and at club level for Salford (captain), as a prop, or second-row, i.e. number 8 or 10, or, 11 or 12, during the era of contested scrums.