This memorial stone (so called Stolperstein or stumbling block) commemorates Rudolf Gruber (born 1893, murdered in Mauthausen on 05-06-1944), persecuted or murdered by the Nazis.
The small copper plaques, in the pavement in front of houses of which the (mostly Jewish) residents were persecuted and mostly murdered by the National-Socialists, mention the name, date of birth and place (mostly a concentration camp) and date of death.
In many other cities and villages, 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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