He was the principal architect of the Coal Mine Safety and Health Act of 1969 and stipulated stringent safety regulations .
1969 for the first time put a ceiling on the amount of respirable coal dust allowed in coal mines .
He was the principal architect of the Coal Mine Safety and Health Act of 1969 , which for the first time put a ceiling on the amount of respirable coal dust allowed in coal mines , and stipulated stringent safety regulations .