When did nobutoshi kihara invent the sony walkman?

Nobutoshi Kihara did not invent the Sony Walkman; rather, he was a key designer and engineer involved in its development. The first Sony Walkman was released in July 1979, revolutionizing portable music consumption. The concept was developed under the leadership of Akio Morita and Masaru Ibuka, the co-founders of Sony. Kihara's contributions were integral to making the device a reality.