Apparatus for indicating gas concentrations, apparatus for recording gas concentrations, air pressure regulators and pressure release valves limiting maximum pressure in respiratory air supply systems, batteries and parts thereof; apparatus for charging; communication apparatus and instruments and controls therefor; apparatus and instruments for detecting, measuring, analyzing and recording fluid flow, gas, mist, dust, pressure and temperature; respiratory protective apparatus; ear protective apparatus; gas calibrators for calibrating gas in gas detectors; downloadable software for use with gas detection, gas calibrators, vapor, gas, fire, and danger alarms, measurement and analysis, fire and danger alarms, plume modeling, thermal imaging, flame detection, respiratory protection, fall detection; respiratory protective apparatus, namely, escape respirators, air-purifying respirators, air-line respirators and self-contained breathing apparatus and parts thereof; protective wearing apparel for miners, industrial workers, firefighters and those engaged in hazardous pursuits, namely, headgear, hats, caps, winter headwear, headbands, hoods; CDs, DVDs and internet streaming media in the field of information regarding occupational hazards and equipment and procedures to reduce and eliminate such hazards and information as to the use, inspecting, testing, fitting, maintenance and repair of such equipment; Personal safety and fall protection equipment other than for sports and not for use in vehicles, namely, harnesses, full body harnesses, lifelines, support belts for workers, safety belts, safety lines, safety straps, reels, self-retracting lanyards, lanyards, rope grabs, restraint lanyards, shock absorbing lanyards and anchorage connectors, energy absorbers, fall arrest devices, ladder climbing safety equipment, namely, ladder fall arresters; confined space entry and/or retrieval equipment, namely, personnel and material handling hoists, self-retracting lanyards with retrieval capability, tripods, davits, rescue kits, and personal rescue equipment; batteries; battery chargers; voice amplifiers and transmitters; gas and hazardous vapor detectors and parts thereof; gas and hazardous vapor measurers and parts thereof; gas and hazardous vapor analyzers and parts thereof; gas and hazardous vapor monitors and parts thereof; gas and hazardous vapor recorders and parts thereof; fire and danger alarms; eye and face protective apparatus, namely, masks, safety goggles, safety glasses protective eyewear and face shields and frames therefor; hearing protection apparatus, namely, ear plugs, ear bands, head bands, ear muffs and headsets, not for medical use; horizontal lifelines and vertical lifelines and descent devices that lower people at a controlled rate of speed; services for the replacement of cable slings and shock absorbers of self-retracting lanyards; downloadable electronic publications in the nature of reports relating to workplace safety, safety awareness, hazard assessment, hazard remediation and operational performance; downloadable software for measuring workplace conditions and safety requirements in relation to workplace safety, safety awareness, hazard assessment, hazard remediation and operational performance; communication systems for respirators comprised of radio transmitters and receivers for use by an individual wearing a respirator; communications systems comprised of transmitters and receivers associated with radio, wireless and wireless network communications and telemetry, voice amplifiers and transmitters; electronic monitors for monitoring gas and fire presence; detectors for gas, fire and flame; gas sensors for measuring gas concentration; controllers for gas sensors; calibration stations comprised of electronic monitors for testing gas detectors and gas monitors; electronic detectors for detecting the presence of harmful chemical and biological, materials; accountability systems for personal alert safety comprised of PASS (personal alert safety system) devices, radio transmitters and receivers; sunshields in the form of polyurethane extensions which attach to headgear to protect the wearer's ears and neck from harmful sun rays; safety and protective clothing; protective clothing to prevent bodily injury in the nature of safety vests; protective helmets; head protection in the form of hard hats, helmets, and caps; rescue hood (respirators); Fire suit (turn out gear); protective helmets for prevention of injury; fire helmets; winter liners for protective helmets; hoods, gloves and coveralls for protection against accidents; rescue cradles and rescue ladders; communications systems comprised of transmitters and receivers associated with radio, wireless and wireless network communications and telemetry, voice amplifiers and transmitters; personal alert safety systems comprised of sensors for surrounding conditions or physical conditions of the user, namely, sensing chemical gas, detecting gas connectivity and sensing capability and presence of gas, sensing of compliance with system component usage guidelines and system parameters or connection to safety monitoring systems and telecommunications transmitters to notify others that a user is in distress or a dangerous condition has been encountered; air and gas purifying canisters, air purifying apparatus, gas masks; instruments for detecting toxic industrial chemicals, namely, toxic industrial chemical detectors; detectors for gas, fire and flame; apparatus for indicating gas concentrations, apparatus for recording gas concentrations; electronic hearing protection incorporated into a communications systems associated with radio communications and telemetry; electronic devices, namely, personal alert safety systems (pass), fall detection systems and apparatus, utilizing physiological monitoring equipment, location determination and geo-fencing; multipoint gas detector controller; fall detection systems and apparatus, namely, personal emergency response systems featuring location determination and geo-fencing; software for control, operation, calibration and storage of information relating to a multipoint gas detector; self-contained breathing apparatus for industrial and firefighting use consisting of facepieces, regulators, compressed air tanks, harnesses and parts therefor; self-contained breathing apparatus for industrial and firefighting use consisting of air masks, regulators, compressed air tanks, harnesses, and parts therefor; communication apparatus and instruments and controls therefor; apparatus and instruments for detecting, measuring, analyzing and recording fluid flow, air currents, gas, mist, dust, noise, pressure and temperature; sound measuring instruments; fire extinguishing apparatus; electronic monitors for monitoring gas and fire presence; electronic apparatus comprised of light, heat and motion sensors for detecting, arranging, monitoring, identifying, and determining direction and distance to emergency responders, positioning, wireless communication in a local network, and integrating sensors and apparatus of emergency responders, in the fields of firefighting and search and rescue; voice communications equipment, namely, amplifiers for use with protective facepieces; protective wearing apparel for miners, industrial workers, firefighters and those engaged in hazardous pursuits, namely, headgear, hats, caps, winter headwear, headbands, hoods, gloves, mittens, mitts, suits, coveralls, jackets, coats, pants, aprons, spats, leggings, foot protectors, leg protectors, toe protectors, knee pads, sleeve protectors, arm protectors, and structural parts therefor; safety signs; fire blankets and cases therefor; dust counting apparatus