MSHA approves Lockheed communication system

The US Mine Safety and Health Administration (MSHA) has approved a new wireless communication system

MSHA approves Lockheed communication system MSHA approves Lockheed communication system MSHA approves Lockheed communication system MSHA approves Lockheed communication system MSHA approves Lockheed communication system

The US Mine Safety and Health Administration (MSHA) has approved a new wireless communication system, which can be used by trapped miners during an accident.