These memorial stones (so called Stolpersteine of stumbling blocks) commemorate:
Benjamin Valk (born 1868, murdered in Auschwitz on 15-10-1942)
Roosje Valk-Menkes (born 1871, murdered in Auschwitz on 15-10-1942)
The small copper plaques, in the pavement in front of houses of which the (mostly Jewish) residents were murdered by the Nazis, mention the name, date of birth and place (mostly a concentration camp) and date of death.
In many other cities, mainly in Germany but also in other European countries, the memorials also can be found. There are already many thousands of these plaques and their number is still counting. Almost all Stolpersteine are laid by the German artist himself, Gunter Demnig.
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