Status of Radiocommunications between Amateur Stations of different Countries (in accordance with optional provision No. 25.1 of the Radio Regulations) and Form of Call Signs assigned by each Administration to its Amateur and Experimental Stations — Change history — ITU Operational Bulletin

ITU Operational BulletinOBISSN 1564-5223

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Status of Radiocommunications between Amateur Stations of different Countries (in accordance with optional provision No. 25.1 of the Radio Regulations) and Form of Call Signs assigned by each Administration to its Amateur and Experimental Stations

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OB No. 1154★ Seed publication1 change