Inventions By dasa55 Period: Jan 1, 1455 to Dec 31, 1455 Typography Period: 1886 to 1886 Car Period: Jan 1, 1903 to Dec 31, 1903 Airplane Period: Jan 1, 1907 to Dec 31, 1907 Helicopter Period: Jan 1, 1957 to Dec 31, 1957 Satellite Period: Jan 1, 1971 to Dec 31, 1971 e-mail Period: Jan 1, 1981 to Dec 31, 1981 Personal Computer