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Interior of an electrodynamical cabin of the P.L.M. Post Office in Paris, showing a large control panel with numerous measuring instruments and switches. The printed text on the front indicates 'One of the cabins of the new Electrodynamical Post Office of Paris-P.L.M.'. The reverse mentions the edition of the 'Bulletin P.L.M.' and the printer J. Herbert, Imp. - Levallois.