Since Roman times the danger of confined spaces has been written about. In 1556, Agricola noted that stagnant air in mines caused breathing difficulties and that fires in mines caused many workers to die inside them. In 1925, Alice Hamilton observed that decomposing organic material in vats, tanks, and manholes emitted hydrogen sulfide and noted how it had caused death by asphyxiation (4). So in 1993, OSHA published a stand
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