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Confined Spaces: Invisible Dangers and the System That Prevents Them
Confined Spaces: Invisible Dangers and the System That Prevents Them   Spaces such as tanks, silos, pits, vaults, and manholes rarely signal danger at first sight. They often appear still, quiet, and uneventful, giving the impression that tasks within them are straightforward and routine. Because nothing seems immediately wrong, it is easy to assume these environments are stable and safe....
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