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Katō Tomosaburō (加藤 友三郎 February 22 1861–August 24 1923) was a Japanese politician and the 21st Prime Minister of Japan from June 12 1922 to August 24 1923.
He was born in Hiroshima prefecture.
| Preceded by: Takahashi Korekiyo | Prime Minister of Japan 1922–1923 | Succeeded by: Yamamoto Gonnohyoe |