These memorial stones (so called Stolpersteine of stumbling blocks) commemorate:
Eduard Leffmann (born 1879, murdered in Auschwitz)
Louis Leffmann (born 1869, murdered in Theresienstadt)
Albert Leffmann (born 1907, murdered in Bergen-Belsen)
Berta Leffmann (born 1916, murdered in Auschwitz)
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.
For more information and pictures, please visit Stolpersteine Mülheim an der Ruhr (in German).
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