| Code | ATH-M-003031 |
|---|---|
| Gender | Male |
| Full name | Kosaku•Sumiyoshi (-Iwasaki) |
| Used name | Kosaku•Sumiyoshi |
| Other names | 住吉 耕作, 岩崎耕作 |
| Born | 1 October 1907 |
| Died | 1971 |
| Sport | Competition | Host City | Country | Event | Placement | Country | |
|---|---|---|---|---|---|---|---|
| Athletics | 1927 Far Eastern Games | Shanghai | Javelin Throw, Men | 🥇 | |||
| Athletics | 1928 International Universities Championships | Paris | Javelin Throw, Men | 🥇 | |||
| Athletics | 1930 Far Eastern Games | Tokyo | Javelin Throw, Men | 🥇 | |||
| Athletics | 1930 Far Eastern Games | Tokyo | Pentathlon, Men | 🥇 |