Two experienced welders were working inside a barge. A gas hose leading to the welding torch developed a leak that the workers apparently could not smell because of "nasal fatigue" from having inhaled so much gas. One worker lit a cigarette, igniting the gas, killing both workers. The workers' heirs sued the gas and gas hose producers in strict liability. Was either company liable? [Little v. Liquid Air Corp., 37 F.3d 1069, 5th Cir. (1994)]