International rules on the protection of copyrighted works
The earliest international rules on the protection of works under copyright law sought primarily to create an international community committed...
Comunicación
Technological and Economic Changes Affecting Communications
In general—and mobile communications in particular—for the purposes at hand the focus is on mobility as the basic factor that...
Telephone Transmission
Telephone signals between subscriber sets and the urban exchange, and between urban and long-distance exchanges, are carried by aerial lines,...
Television
The information to be transmitted in a television system is represented by the differences in illumination (and eventually in color)...
Multiplex Telegraphy
Multiplex telegraphic systems are those that allow the simultaneous transmission of more than one message in the same direction. They...
