international telegraph conference 1932 madrid

International Telegraph Union, International Telegraph Conference (1932 Madrid) · Bureau international des administrations télégraphiques

Sayfa sayısı yok · 1933

Radio (International law) / Congresses / Telegraph (International law) / International telecommunication convention (1932)

International Telegraph Conference (4th 1932 Madrid). · Bureau international de l'Union tbelbegraphique

64 sayfa · 1933

International Telecommunications Convention (1932) / Law and legislation / Telegraph

International Telegraph Conference (1932 Madrid) ((4th revision of convention) · Bureau international de l'Union télégraphique

64 sayfa · 1933

International Telecommunications Convention (1932) / Law and legislation / Telegraph / International Telecommunication Convention