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Miscellaneous Radio-Telephone SystemsIn addition to the services just described, amplitude-modulation radio-telephone systems are used for private communication networks such as those used by police, aircraft operating companies, and others. Such equipment is also used in emergencies for bridging gaps in wire telephone lines and for providing telephone toll services across bodies of water.35 Several miscellaneous radio services, to be considered later, now use angle modulation.
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Last Update: 2011-04-17