The United States Court of Appeals for the Third Circuit has held that under Pennsylvania law where a knowledgeable purchaser of equipment instructs the manufacturer to remove a standard safety device prior to the equipment's delivery the manufacturer is liable for injuries resulting from the lack of the safety device even where the equipment was used by an experienced operator.
Hammond v. International Harvester, 691 F.2d 646 (3d Cir. 1982).
William A. Behare,
Tort Law - Product Liability - Manufacturer's Duty to Provide Necessary Safety Equipment - Effect of Purchaser's Request That Safety Equipment Be Removed,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol22/iss4/15