radio voice communication system comprised of antenna, microphone and transceiver for providing radio voice communication between journeymen firefighters, police, military personnel, industrial employees and hazardous material handling personnel and between journeymen and a group leader and between a group leader and a communication center such as a fire engine or fire company, base station or repeater; plastic or metal interlocking device for attaching a face shield to a firefighter's helmet...

life support systems, namely self contained breathing apparatus for firefighting and industrial applications and parts therefor