published on: 2015-01-14 05:21:17
kat-revolution.tumblr.com/post/108052776158/
kat-revolution.tumblr.com/post/108052785168/
engineeringhistory: Sony Walkman portable cassette player, introduced
kat-revolution.tumblr.com/post/108113283828/
kat-revolution.tumblr.com/post/111818652043/
kat-revolution.tumblr.com/post/111819824233/