File:原口竹次郎(早稲田大学教授時代).jpg
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![File:原口竹次郎(早稲田大学教授時代).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/%E5%8E%9F%E5%8F%A3%E7%AB%B9%E6%AC%A1%E9%83%8E%EF%BC%88%E6%97%A9%E7%A8%B2%E7%94%B0%E5%A4%A7%E5%AD%A6%E6%95%99%E6%8E%88%E6%99%82%E4%BB%A3%EF%BC%89.jpg/450px-%E5%8E%9F%E5%8F%A3%E7%AB%B9%E6%AC%A1%E9%83%8E%EF%BC%88%E6%97%A9%E7%A8%B2%E7%94%B0%E5%A4%A7%E5%AD%A6%E6%95%99%E6%8E%88%E6%99%82%E4%BB%A3%EF%BC%89.jpg?20210907013708)
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