Fortunately, I was given a legendary textbook called "臨床心音図学" by a senior member of the medical college. This was prompted by an e-mail from Dr. Tsuguya Sakamoto, which I forwarded to my former boss, who sent the mail to the senior member.
This is the book I have been looking for for many decades. I would have paid a considerable amount of money for the legendary textbook if it had been sold on the Internet, as it has been out of print for almost half a century. This time I was able to get it for free. I am very grateful.
I have now collected all three legendary books on phonocardiography. When I told Dr. Sakamoto that I had succeeded in collecting his three books, he told me some interesting stories, such as that he did not receive any personal royalties from the three books.
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Of course, I know that it is not enough to have them; I have to read the masterpieces and learn from them. But I am quite content to see them on the bookshelf in my hospital room.