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PackPro manufactured a conveyor with a guard and an electrical interlock that stopped the belt when the guard was opened. PackPro sold the conveyor to a distributor, which sold it to a food plant. The food plant later removed the guard and bypassed the interlock to speed cleaning. PackPro's service bulletins had warned that plants sometimes bypassed interlocks unless the controls were sealed, and a sealed-control design was available at modest cost when the conveyor was sold.
Three years later, the food plant sold the conveyor to UsedLine, a business that regularly refurbishes and resells industrial machinery. UsedLine saw the bypassed interlock but resold the conveyor without repair or warning. A worker at the next plant was injured when his sleeve caught in the moving belt during cleaning.
Analyze the worker's products-liability claims against PackPro, the distributor, and UsedLine. Discuss alteration, foreseeable misuse, and causation.