H. I. Romnes
Abstract
In the 30 years since radio first took a regular place in the United States' telephone plant, its use has spread into many parts of the telephone network, making possible world wide telephony and other extensions of service.
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In the 30 years since radio first took a regular place in the United States' telephone plant, its use has spread into many parts of the telephone network, making possible world wide telephony and other extensions of service.
Key concepts: Telephony, Mobile radio telephone, Telecommunications, Telephone network, Service (business), Telegraphy, Telephone exchange, Postal service