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2001年12月13日，北京市政管理委员会、北京市建设委员会、北京市公安局、北京市交通局、北京市质量技术监督局和北京市环境保护局2委4局联合发布了《关于渣土砂石运输车安装使用全密闭运输装置从事运输的通告》。《通告》要求，自2002年4月30日起，凡未安装使用全密闭运输装置
December 13, 2001, the Beijing Municipal Administration Commission, the Beijing Municipal Construction Commission, the Beijing Municipal Public Security Bureau, Beijing Bureau of Transportation, Beijing Municipal Bureau of Quality and Technical Supervision and Beijing Municipal Environmental Protection Bureau 2 4 Bureau jointly issued the “ Stone transport vehicles installed using fully enclosed transport device in the transport notice. ” The circular requires that, since April 30, 2002, all closed conveyors have not been installed