Mezue ahịrịokwu na-esonụ: Jans Koster (amụrụ na 1938) bụ onye na-egwu mmiri Dutch na-agba mmiri. O nwetara ihe nrite ọlaedo na
1958 European Aquatics Championships (400 m) ma setịpụ ihe ndekọ Europe abụọ na ụwa abụọ na 1500 m na 1956<unk>1957. Na 9 Machị 1960 ọ lụrụ Ben Hulsegge.