Short afterwards the Second World War, the Laboratories Bell (Bell Laboratories) undertook a program for benefit of communication services with systems which used common institution (common carrier), so that are served a lot of users together moved in different geographic bands. This service was registered in the FCC with the name Public Internal Service of Land Mobile Radios of Communications (Domestic Public Land Mobile Radio Service - DPLMRS). Service DPLMRS undertook the below two systems: • First of them it functioned in 1946 for the cover of communication needs of users which wa...

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