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2. Posteriorment van inventar un altre sistema de comunicaci: l' escriptura.' escriptura. 3. TEL GRAF 18731873 Cooke iCooke i WheatstoneWheatstone 4. TELFON 1876, Graham Bell i Elisha Gray 5. FONGRAF 1877 Thomas AlvaEdison 6. GRAMFON 1887, Emile Berliner 7. RDIO1901 Guillermo Marconi 8. TELEVISI 1926 John Logie Baird 9. MAGNETFON (CASSET)1929 Fritz Fleumer 10. MAGNETOSCOPI 1956 per AMPEX 11. MICRFON
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