3. next, concrete, metal, decorative (chia), Cut, move can be a dangerous substance, chemical, acid, or other protective devices must be worn face and eyes all the time.4. when working in a dangerous toxic substance, toxic, gas or air in the area is not pure. Need to use a respirator or air purifiers, see smoke or use a ventilation fan.5. those who have received safety chaekrongthao (shoes, steel head). Everyone. Must be worn while working and is always?6. the safety belt is in good condition and must be used at all times when it is running on high.7. when cutting metal with gas must wear gloves and goggles should be worn to reduce exposure.
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