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劳动力市场 · 1998/4/221 分钟阅读
Safety Standards for Roof Bolts in Metal and Nonmetal Mines and Underground Coal Mines
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摘要
MSHA is revising its safety standards for roof and rock bolts at metal and nonmetal mines and underground coal mines by updating the reference to the American Society for Testing and Materials (ASTM) standard for roof and rock bolts and accessories. The new reference reflects technological advances in the design of roof and rock bolts and support materials. It will improve the level of protection provided by the standards currently in use.
来源原始语言: Federal Register — Department of Labor打开原始公告 →