The complete set in detail
F0844
SG 1072
Conference C.I.T.T. : Claude Chappe (1763-1805), engineer - 10 Fr. red
F0845
SG 1073
Conference C.I.T.T. : F. Arago (1786-1853) and A.M. Ampère (1775-1836), Physicists - 15 Fr. black brown
F0846
SG 1074
Conference C.I.T.T. : Emile Baudot (1845-1903), engineer - 25 Fr. claret
F0847
SG 1075
Conference C.I.T.T. : General Ferrié (1868-1932), military telegraph - 50 Fr. blue
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