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Danger warning sign of "Confined Space" work place, risk for asphyxiation fatality. Industrial equipment safety sign, close-up.
opened rusty manhole on the yellow plat-from offshore confined space
Crew member wearing breathing apparatus exits a narrow hatch after providing first aid during a man evacuation drill from a confined space on a merchant ship.
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confined space entry by permit only.A clear warning sign informs about confined space rules at a construction site, emphasizing that entry is allowed only with a proper permit. Safety is a priority.

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