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技術開発スピリット  Spirit of technology development

The 40th anniversary of the Sony Walkman:
The 30 minute-long BBC Technology News on the title was on air this morning (midnight in London).
I have known that today (yesterday, Japan time) is 40th anniversary of the Sony Walkman through the foreign media.
It said, “Today marks the 40th anniversary of the Sony Walkman, a piece of technology that not only rocked the recording industry, but fundamentally changed how we all experience music.”
It is so great, isn’t it? 
The attached picture is a present from NHK Tokyo when they came to me to cover the power saving technology of my own development 23 years ago.
I still have kept it with care.