I removed the cause-of-death of COVID-19 that you added to Takuo Aoyagi, and thought I'd leave a note to clarify why. Although the nytimes includes him in their coronavirus coverage (as the developer of the pulse oximeter), they say in the article that his cause of death was unknown. I didn't find any reliable source giving a specific cause of death. A japanese obit listed the non-specific cause as "old age", if I understood its google translate correctly.