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BREGUET Extensive collection of diagrams and technical drawings of communication devices, including - Hippe (Bern) mobile device (cross-section), dated 26.9bre.55 and numbered 133B - General plan of a Hippe (Bern) mobile device, dated September 26, 1855, and numbered 131B -Full-scale telegraph key signed by Bouchot in Paris on January 26, 1872, and numbered 138B, on paper with a Blauw watermark and the HP coat of arms. A second one, dated January 27, 1872, is included -Morse key, numbered 129B -Indicator key (No. 4531), dated April 1854 and numbered 150B -Arlincourt relay (single, for line terminus), signed by Leon Dienne, dated May 1874 and numbered 120B. A second, unnumbered item is included: -Vertical continuous-paper recorder, numbered a142bis (96 x 61.5 cm) -Relay, in color, number 117B, signed Breguet -Engraving titled “Two-way Morse telegraph station,” Plate IV from L. Breguet’s *Manual of Electrical Telegraphy* The smallest: 23 x 36 cm Stains, scattered creases and tears; mixed paper types
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