On September 15, Dan Chipparone, a 24-year-old apprentice iron worker who was helping guide a 12-ton crane, was pinned under its 150-foot boom when the mast dropped. His right leg was severed below the knee and he lost part of his left foot. The crane also crushed the cab of a cement mixer and a pickup truck.At the time of the accident, a construction crew was at work building support columns for a new access road to San Francisco International Airport. As the crane was lowering a 60-f
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