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Manhole refers to the orifice device used for personnel to enter and exit equipment, containers, pipelines and other closed Spaces.

Manhole refers to the orifice device used for personnel to enter and exit equipment, containers, pipelines and other closed Spaces.

Manhole refers to the orifice device used for personnel to enter and exit equipment, containers, pipelines and other closed Spaces.

Manhole refers to the orifice device used for personnel to enter and exit equipment, containers, pipelines and other closed Spaces.

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