The couple had a clothes shop in de Choorstraat.
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The Police Commissioner of Delft requested on behalf of the Sicherheitspolizei in The Hague that Daniel van IJssel, shopkeeper, and his wife Serlina van IJssel-de Vedder, both living in Delft, be located, detained and brought to trial. They were suspected of having changed their place of residence without the required authorization. This description referred to Jews who had gone into hiding.
Algemeen Politieblad nr 38, 24 September 1942, 1087, notice 2061
In addition, a Jokos file (number 7717) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 13399 / 15804).