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On the sign:
DANS CETTE MAISON HABITAIT MAURICE GROHAR SERGENT F.T.P.F DE 17 ANS ASSASSINÉ PAR LES NAZIS
F.T.P.F - Francs-tireurs et partisans français - Francs-Tireurs et Partisans - the communist underground in France
Maurice Grohar was a Jewish boy born in Paris in 1925. As mentioned, he was a member of the communist underground in France. Sent by the Nazis to the Auschwitz extermination camp where he was murdered.