Here is a look at the history of the Sony Walkman, a device created in 1979 by Masaru Ibuka and Akio Morita that ushered in the era of portable music.
Sony Group Portal - Product & Technology Milestones−Personal Audio
The history of the Walkman: 35 years of iconic music players - The
Sony's first Walkman, the sequel, and the recorder that started it
In Remembrance Of: A History of the Walkman
A brief history of the Sony Walkman – Dan The Man Trivia
List of Sony Walkman products - Wikipedia
The Evolution of the Sony Walkman - Moon Audio
A Brief History of The Walkman - TIME
The Walkman turns 35: What was the first song you played?
Research vs Vision: the origin story of Sony Walkman, Mini Cooper
Walkman - Wikipedia
A Brief History of the Walkman – Outdoor Speakers UK