The first telephones were connected by point-to-point networks, similar to those used by the telegraph system.
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Q71: The years between 1920 and 1960 are
Q72: Samuel Morse developed and patented a telegraph
Q73: Radio technology is the basis for cell
Q74: A(n) _ is any person or company
Q75: Telephone networks are based on a hierarchy
Q77: Transmitting data in a telegraph system used
Q78: A(n) _ is a device that uses
Q79: A(n) _ is a device that transmits
Q80: _ refers to transmitting text or symbolic
Q81: Technology workers encompass jobs such as telephone
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