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Regulating and measuring devices and apparatus with flame traps and shock wave absorbers for pressure release relating to gas and dust explosions, namely, pressure gauges, pressure relief valves, pressure control equipment being blowout preventers and fire extinguishing apparatus

Regulating devices with flame traps and shock wave absorbers for gas devices and installations, namely, safety accessories for gas pipes being flashback arrestors and reverse flow check valves, gas regulators and dust control filters for gas conditioning