In 1921, he became a member of the British Society for the Study of Orthodontics (BSSO) and a member of European Orthodontic Society (EOS) in 1926.
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Watkin first worked in the Equipment Department of the National Telephone Company and helped develop the first fully automatic telephone exchange in Staffordshire Potteries that opened in 1904.
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With a growing reputation as an outstanding clinician, in 1933, he became President of the British Society for the Study of Orthodontics.
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