Sjoerd Lambertus "Bertus" Mooi Wilten (30November 191327June 1965) was a Dutch swimmer. He joined the swimming club HPC in Heemstede. In 1934–35 he broke the Dutch national record on the 100 m freestyle twice for the long course and four times for the short course, reaching 1:00.6 in February 1935.History of Dutch long course 100 m freestyle for men national recordsHistory of Dutch short course 100 m freestyle for men national records He competed in the men's 100 metre freestyle at the 1936 Summer Olympics, but was eliminated in the second heat.
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