Aeronautical Mobile, Aeronautical Mobile Satellite, Aeronautical Radionavigation, Amateur, Amateur Satellite, broadcasting, Broadcasting Satellite, chart, Earth Exploration Satellite, Fixed, Fixed Satellite, Frequency, Inter-Satellite, Land Mobile, Land Mobile Satellite, Maritime Mobile, Maritime Mobile Satellite, Maritime Radionavigation, Meteorological Aids, Meteorological Satellite, Mobile, Mobile Satellite, Radio Astronomy, radio spectrum, Radiodetermination Satellite, Radionavigation, Radionavigation Satellite, Space operation, Space Reseach, Standard Frequency, Time Signal, Time Signal Satellite, United States, US, usa, www.ntia.doc.gov
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