Famous People of Japan
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Takuo Aoyagi

青柳卓雄
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Takuo Aoyagi (青柳卓雄, Aoyagi Takuo; February 14, 1936 — April 18, 2020) was a Japanese engineer, known for his work leading to the modern pulse oximeter.

Source: “Takuo Aoyagi”, English Wikipedia (CC BY-SA 4.0), excerpt

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