Billy Mainwaring
| Born | Gwilym Thomas Mainwaring 24 January 1941 Port Talbot, Wales | ||||||||||||||||||||||||||||||||||||||||
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| Died | 1 April 2019 (aged 78) | ||||||||||||||||||||||||||||||||||||||||
| School | Eastern School, Taibach | ||||||||||||||||||||||||||||||||||||||||
| Occupation | steelworker | ||||||||||||||||||||||||||||||||||||||||
| Rugby union career | |||||||||||||||||||||||||||||||||||||||||
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William Thomas Mainwaring (born Gwilym Thomas Mainwaring; 24 January 1941 – 1 April 2019) was a Welsh international second row rugby union player who played for Aberavon RFC.