File:Operator's certificate of skill in radiocommunication (1911).gif
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![File:Operator's certificate of skill in radiocommunication (1911).gif](https://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Operator%27s_certificate_of_skill_in_radiocommunication_%281911%29.gif/370px-Operator%27s_certificate_of_skill_in_radiocommunication_%281911%29.gif?20190518223944)
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