Technische Mitteilungen / Schweizerische Telegraphen- und Telephonverwaltung = Bulletin technique / Administration des télégraphes et des téléphones suisses = Bollettino tecnico / Amministrazione dei telegrafi e dei telefoni svizzeri
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Volume 23 (1945) Issues available
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Volume 22 (1944) Issues available
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Volume 21 (1943) Issues available
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Volume 20 (1942) Issues available
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Volume 19 (1941) Issues available
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Volume 18 (1940) Issues available
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Volume 17 (1939) Issues available
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Volume 16 (1938) Issues available
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Volume 15 (1937) Issues available
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Volume 14 (1936) Issues available
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Volume 13 (1935) Issues available
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Volume 12 (1934) Issues available
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Volume 11 (1933) Issues available
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Volume 10 (1932) Issues available
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Volume 9 (1931) Issues available
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Volume 8 (1930) Issues available
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Volume 6 (1928) Issues available
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Volume 5 (1927) Issues available
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Volume 4 (1926) Issues available
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Volume 3 (1925) Issues available
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Volume 2 (1924) Issues available
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Volume 1 (1923) Issues available