radiotelegraph installation

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General radiotelephone operator license — The General Radiotelephone Operator License, or GROL, is a commercial license, as opposed to an amateur radio license. It allows the holder to operate, maintain or install certain classes of United States licensed radio and television… … Wikipedia
Global Maritime Distress Safety System — The Global Maritime Distress and Safety System (GMDSS) is an internationally agreed upon set of safety procedures, types of equipment, and communication protocols used to increase safety and make it easier to rescue distressed ships, boats and… … Wikipedia
Signal Corps (United States Army) — U.S. Army Signal Corps Coat of Arms Active 3 March 1863 – Present Country … Wikipedia
Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism … Wikipedia

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