Heckman, an employee of Clark Equipment Company, severely injured his left hand when he caught it in a power press that he was operating at work. The press was manufactured by Federal Press Company and sold to Clark eight years earlier. It could be operated either by hand controls that required the use of both hands away from the point of operation or by an optional foot pedal.

When the foot pedal was used without a guard, nothing remained to keep the operator's hands from the point of operation. Federal Press did not provide safety appliances unless the customer requested them, but when it delivered the press to Clark with the optional pedal, it suggested that Clark install a guard. The press had a similar warning embossed on it.

Clark did, in fact, purchase a guard for $100, but it was not mounted on the machine at the time of the injury; nor was it believed to be an effective safety device. Heckman argued that a different type of guard, if installed, would have made the press safe in 95 percent of its customary uses.

Federal, in turn, argued that the furnishing of guards was not customary in the industry; that the machine's many uses made it impracticable to design and install any one guard as standard equipment; that Clark's failure to obey Federal's warning was a superseding cause of the injury; and that state regulations placed responsibility for the safe operation of presses on employers and employees. The jury awarded Heckman $750,000, and Federal appealed. Decision?