THE EVOLUTION OF PORTABLE AUDIO DEVICES By Kadeem Shaik Nov 1, 1954 Transistor radio Transistor radio, 1954 Jul 1, 1979 Walkman Mar 15, 1983 Discman Dec 10, 1999 Mp3 Oct 23, 2001 Ipod classic Sep 7, 2005 Ipod nano Sep 5, 2007 Ipod touch
