Telephone companies have other uses for their wires besides letting you use them to keep in touch with your friends. They lease them to burglar alarm, news and stock-ticker companies. When a convention or concert is to be broadcast from a hall, it is often sent over a leased telephone wire to a radio studio, thence sent out over the air. Because it is easy to transmit music by wire, with a loudspeaker at the receiving end to amplify it, it occurred to Robert Miller, onetime engineer for Bell Telephone Laboratories, Inc.,...
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