Revolution of Portable Audio Devices By ceeeliacai Feb 11, 1972 Stereo Belt Jan 22, 1976 BoomBox Jul 1, 1979 Sony Walkman TPS-L2 Sep 8, 1984 Discman D-5/D-50 Mar 28, 1998 MPMan Oct 23, 2001 iPod May 5, 2007 Panasonic Stero Cassette Player RQ-JA63 Jul 2, 2007 iPod Touch
