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Person observing tunnel area construction. Architecture of tunnel design and architect seeing tunnel architecture design with safety instrument. Ensure safety in confined space of tunnel construction.
Confined space work illustration at industry or construction. Safety rules of permit entry.
Conduct gas test before entering confined space safety awareness. Vector banner and poster design. Work illustration.
be careful of oxygen deficiency confined space sign
Set of confined space work entry icon for industrial, construction, and manufacture work safety.
Set of confined space work entry symbol and icon for industrial, construction, and manufacture work safety.

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