| 1895 | | | | 1918 4 | | | | | | 1946 2 5 | ENAC 20 | | | 20 | | | | | | | | 1960 | 1965 5 | | | | | | | | | 1960 8 | | | | | AMPS 1979 | | | 1969 | ARPANET | |