Coal Mine Health and Safety: Hearings, Ninety-first Congress, First Session, on S. 355 [and Others].U.S. Government Printing Office, 1969 |
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Σελίδα 40
... volume per centum 4 of methane , changes or adjustments shall be made at once 5 in the ventilation in such mine so that such air shall not 6 contain more than 1.0 volume per centum of methane . If 7 such air , when tested at a point not ...
... volume per centum 4 of methane , changes or adjustments shall be made at once 5 in the ventilation in such mine so that such air shall not 6 contain more than 1.0 volume per centum of methane . If 7 such air , when tested at a point not ...
Σελίδα 120
... volume per centum of 6 methane , changes or adjustments shall be made at once in 7 the ventilation in such mine so that such air shall not contain 8 more than 1.0 volume per centum of methane . If such air , 9 when tested at a point not ...
... volume per centum of 6 methane , changes or adjustments shall be made at once in 7 the ventilation in such mine so that such air shall not contain 8 more than 1.0 volume per centum of methane . If such air , 9 when tested at a point not ...
Σελίδα 174
... volume per centum of 4 methane , changes or adjustments shall be made at once in 5 the ventilation in such mine so that such air shall not contain 6 more than 1.0 volume per centum of methane . If such air , 7 when tested at a point not ...
... volume per centum of 4 methane , changes or adjustments shall be made at once in 5 the ventilation in such mine so that such air shall not contain 6 more than 1.0 volume per centum of methane . If such air , 7 when tested at a point not ...
Περιεχόμενα
COAL MINE HEALTH AND SAFETY | 1 |
II | 7 |
Boyle W A president United Mine Workers of America accompanied | 454 |
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abandoned action active adequate agency amount appeal application appropriate approved authorized bill blasting Board BOYLE Bureau cables carry cause centum certified circuit coal mines committee contain continue copy court danger decision designated determine devices Director dust duties effective electric employees enter entries equipment examination exists experience explosives face Federal feet filing finds fire ground hazardous health and safety hearing immediately industry inspection inspector installed issued least legislation less lignite located maintain manner material means measures methane miners necessary notice official operator pass period permissible permit person practices prescribed present proceeding protection reasonable record relating representative request roof safety standards Secretary Senator Senator WILLIAMS subsection surface tests thereof tion underground United unless ventilation violation volume wires Workers