Seizō Itō, <a href="https://en.wikipedia.org/wiki/en:Kiyoshi_It%C5%8D" class="extiw" title="w:en:Kiyoshi Itō">Kiyoshi Itō</a>, Tsuyo Itō and Seitarō Itō posed for photos with Seihachi Itō and Mishi Itō on 1937.
写真提供：伊藤清氏のご遺族
1937
<a rel="nofollow" class="external text" href="https://mathsoc.jp/meeting/ito100/album/index-jp.html">伊藤清先生のお写真</a>