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Terrestrial Trunked Radio (TETRA) (formerly known as Trans-European Trunked Radio) is a professional mobile radio and two-way transceiver (colloquially known as a walkie talkie) specification. TETRA was specifically designed for use by government agencies, emergency services, (police forces, fire dpartments, ambulance) for public safety networks, rail transportation staff for train radios, transport services and the military.
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View also services categories "Public telecommunication services"