Mining machine manufacturer Mining Maintenance Services (MMS) designs and manufactures underground coal mining machines that ...

(AP) — Retired coal miner ... of a mine. They examine electrical and ventilation systems that protect miners from deadly black lung disease, inspect impoundment dams and new roof bolts, and ...

Retired coal miner ... section of a mine. They examine electrical and ventilation systems that protect miners from deadly black lung disease, inspect impoundment dams and new roof bolts, and ...