Communications Technologies By bptruett Jan 1, 1792 Optical Telegraph Jan 1, 1828 Electrical Telegraph Jan 1, 1843 Telefax Jan 1, 1846 Image Telegraph Jan 1, 1846 Teleprinter Jan 1, 1874 Telephone Jan 1, 1901 Radio Relay Jan 1, 1907 Land Mobile Jan 1, 1927 Videophone Jan 1, 1973 Cellular Radio Jan 1, 1993 E-mail Jan 1, 1993 Smartphones
