سوق العمل · 30/6/19971 دقائق للقراءة
Safety Standards for Roof Bolts in Metal and Nonmetal Mines and Underground Coal Mines
ترجمة آلية محلية · اللغة الأصلية للمصدر
الملخص
MSHA is extending the comment period regarding the Agency's proposed rule for roof and rock bolts at metal and nonmetal mines and underground coal mines which was published in the Federal Register on April 28, 1997.