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Sign at the entrance to an air raid shelter: "Ring. We'll open up for you."
The Commission believed that the cellars of this apartment building, at 28 rue de Sarrette in the 14th arrondissement, would hold 40 people.
Sign, 17,5 x 26,5 cm, 1918
© Bibliothèque historique de la Ville de Paris / Roger Viollet