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Male into work inspection process chemical into chemical stainless tank
Blower fresh air into fuel oil storage tank confined space
The movement of those who work in confined spaces that look like deep holes by using ropes to rappel themselves into deep holes.
Yellow air ducts, fittings in ventilation systems of working in confined spaces, confined spaces are vertically pitted. It has a lot of depth.
Air blowers with proboscis yellow are used to blow air when working in confined space areas at manhole doors

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