International Radiotelegraph Convention (1912)

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The International Radiotelegraph Convention (1912) established an agreement to allow the exchange of radio telegraphs (with the intention to connect this new network to wired telegraph). International callsigns, replacing the three letter callsigns prevalent then. Major world powers were given single prefixes such as N/K/W (United States), A (Germany), F (France), B (Great Britain). British colonies were given the call signs starting with V.[1] The convention was signed at the International Radiotelegraph Conference in London on July 5, 1912.[2] Additional regulations were added in 1927 (effective 1929) in Washington, D.C..[3]

The following countries were party to the conventions:

Signatory 1912 1927
Argentine Republic Y Y
Austria Y Y
Belgian Congo Y Y
Belgium Y Y
Bolivia Y
Brazil Y Y
British India Y Y
Bulgaria Y Y
Canada Y Y
Chile Y Y
China Y
Chosen Y
Commonwealth of Australia Y Y
Costa Rica Y
Cuba Y
Curaçao Y
Cyrenaica Y
Czechoslovakia Y
Denmark Y Y
Dominican Republic Y
Dutch East Indies Y Y
Egypt Y Y
Erythrea Y
Estonia Y
Finland Y
France Y Y
French Equatorial Africa and other Colonies Y Y
French Indo-China Y Y
French West Africa Y Y
Germany Y Y
Great Britain Y Y
Greece Y Y
Guatemala Y
Hungary Y Y
Irish Free State Y
Italian Somaliland Y
Italy Y Y
Japan Y Y
Japanese Sakhalin Y Y
Kingdom of the Serbs, Croats and Slovenes Y
Madagascar Y
Mexico Y Y
Monaco Y
Morocco (with the exception of the Spanish Zone) Y
New Zealand Y
Nicaragua Y
Norway Y Y
Paraguay Y
Persia Y Y
Peru Y
Poland Y
Portugal Y Y
Portuguese East Africa Y Y
Portuguese Possessions in Asia Y Y
Portuguese West Africa Y Y
Republic of Colombia Y
Republic of El Salvador Y
Republic of Haiti Y
Republic of Honduras Y
Republic of Liberia Y
Republic of Panama Y
Republic of San Marino Y
Roumania Y Y
Russia Y
Siam Y
Spain Y Y
Spanish Colony of the Gulf of Guinea Y
Surinam Y
Sweden Y Y
Switzerland Y
Syro-Libanese Territories Y
Taiwan Y
Kwantung Leased Territory and South Sea Islands under Japanese Mandate Y Y
Netherlands Y Y
Tripolitania Y
Tunis Y Y
Turkey Y Y
Union of South Africa Y Y
United States Y Y
Uruguay Y Y
Venezuela Y


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