National swimming competitions for the dam Triebels and Obeltbeker at the Heiligeweg in Amsterdam. Bert Sitters (right), Rein Kraay Annotation: The cup is named after 'swimmother' Triebels-Koens (1865-1955). She worked to teach people how to swim at a time when it was not customary Date: 10 February 1963 Location: Amsterdam, Noord-Holland Keywords: competitions, swimming Person name: Kraay, Rein, Sitters, Bert

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