published on: 2015-02-23 02:14:11
engineeringhistory: Sony Walkman portable cassette player, introduced
kat-revolution.tumblr.com/post/108113283828/
kat-revolution.tumblr.com/post/111819824233/
kat-revolution.tumblr.com/post/111819858398/
kat-revolution.tumblr.com/post/111819881758/
kat-revolution.tumblr.com/post/111819931003/