Results of Labor Statistics Field Survey. [Factories, Mines, Factory Workers and Miners by Industry and Scheduled Working Hours] (Oct. 10, 1930) : Statistical Yearbook of Imperial Japan 53 (1934) Table 195B
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PERIOD: As of 1924, 1927 and 1930. By industry, as of October 10, 1930. SOURCE: [Survey by the Statistics Bureau, Imperial Cabinet].
时期：自1924年、1927年至1930年。按行业分类，截至1930年10月10日。来源：[皇室内阁统计局调查]
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