Topaasstraat 9 II, Amsterdam Previous house Next house Residents in February 1941 Mozes Groenman 1860 - 1942 Alida Groenman-Koster 1873 - 1943 Siegfried Groenman 1911 - 1944 Lea Nora Groenman 1910 - 1943 Sara Koster 1876 - 1942