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(title 17, U. S. Code).
(TELEGRAPHY.). DIGEON, L. Avertisseur Universel. Brevete S.G.D.G. en France et a L'Etranger. Paris: 1888. 1st ed. 8vo. 16 pp. Extensively illustrated. Orig. self-wraps. Colored pencil markings on title. $50.00
A universal signal system.