On July 23, 1917, an industrial accident occurred at a Swift & Company meatpacking plant in Chicago, Illinois. The facility relied on an ammonia-based refrigeration system, which circulated anhydrous ammonia through pipes to cool storage areas—a common practice in early twentieth-century food processing. At approximately 2:47 PM, a major pipe ruptured due to advanced corrosion. A dense cloud of ammonia gas rapidly spread through the building. Around 150 workers were inside when the leak began. A
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