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när så krävs i arbetarskyddsdokumentet skall gruvgaskoncentrationen mätas i frånluften från brytningsområden med mekanisk brytning och drivning samt vid gavlarna i blindgångar med mekaniserad drift.
where required by the safety and health document, firedamp levels must also be continuously monitored in return airways from production units using mechanized extraction or underwinning and at the head ends of mechanized blind end workings.