Development Of Communications- From Telegraph To Tv
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✎ Suggest a correctionShows man's efforts to communicate--devices that have been invented to improve communication, and their effects on the social, cultural, and economic life of the people. The battery, ground connections, electromagnet, telephone, telegraph, cable, wireless, radio and television are illustrated.
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- A-V Online (National Information Center for Educational Media). CD-ROM database of educational and documentary media, compiled and maintained by the National Information Center for Educational Media (NICEM). — title, year, creator, length, format, sound, description
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