Jans Koster (born 1938) is a retired Dutch freestyle swimmer. She won a gold medal at the 1958 European Aquatics Championships (400 m)EUROPEAN SWIMMING CHAMPIONSHIPS (WOMEN). gbrathletics.com and set two European and two world records in 1500 m in 1956–1957.Jans Koster . zwemmenindepolder.nl On 9 March 1960 she married Ben Hulsegge.Huwelijk van Jans Koster en Ben Hulsegge. gahetna.nl
See also World record progression 1500 metres freestyle
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