In 1891, Congress passed the first federal statute governing mine safety.
Financing also came from local miners under the guise of improved mine safety.
China has the world's worst mine safety record.
He appeared as an expert witness before several government inquiries, and was a commissioner on that investigating mine safety in 1882.
The vehicle is also armoured for added mine safety, as well as protection from small arms fire.
Recent innovations from Modular have come in the areas of machine guidance, remote vital signs monitoring, and mine safety.
The disaster has focused attention on the harsh working conditions of Mexican miners and provoked a national debate on mine safety.
Dr. Nieto is often interviewed by news networks on mine safety and technology news.
Rodney Brown, a spokesman for the mine safety and health administration, said on Friday that the agency would not comment on a personnel matter.
"The Mine Safety and Health Administration is pursuing investigations in other districts."
