<prompt> Bhala ukuqhubeka kwalesi sigaba - UHetty Balkenende owaziwa nangokuthi uHettie, owazalwa ngo-1939 ungumbhukudi wangaphambili we-freestyle kanye nombhukudi ovumelanisiwe waseNetherlands owathola indondo yesiliva ku-4 × 100 m freestyle relay ku-1954 European Aquatics Championships  <response>: . futhi. Ngo-1955, wasiza iqembu laseNetherlands ukubeka irekhodi lomhlaba kulo mcimbi ofanayo; uphinde wanqoba iziqu ezimbili zikazwelonke i-100 m ne-400 m freestyle, waphula amarekhodi amabili kazwelonke kuma-400 m freestyle, kanye nerekhodi lomhlaba kumamitha angama-880 konke ngonyaka owodwa. 