In the mid-1960s through 1987, the plaintiffs worked as grinders at the General Dynamics Corporation Electric Boat facility in Groton, Connecticut, where their duties required them to use pneumatic hand tools manufactured by the defendants Chicago Pneumatic Tool Company, Stanley Works, and Dresser Industries, Inc., to smooth welds and metal surfaces.
During this employment the plaintiffs developed permanent vascular and neurological impairment of their hands, manifesting as blanching of the fingers, pain, numbness, tingling, reduction of grip strength, cold intolerance, and clumsiness, symptoms diagnosed as hand arm vibration syndrome.
Ronald Guameri, an industrial hygienist at Electric Boat, performed extensive testing of tools used at the shipyard and found that a large number of the defendants' tools violated vibration exposure limits established by the American National Standards Institute and exceeded the threshold limit promulgated by the American Conference of Governmental and Industrial Hygienists. Richard Alexander, a mechanical engineering professor, testified that methods to reduce vibration through isolation, dampening, and balancing had been available to manufacturers for at least thirty-five years.
Charles Suggs, a research engineer, testified that he had reduced vibration hazards in chain saws by inserting rubber mounts in the 1960s, reduced vibration by 70 percent in tools without handles in the 1970s by wrapping them with resilient foam rubber and a metal sleeve, and in 1988 reduced vibration levels in the defendants' die grinders by between 35 and 60 percent using similar techniques. After a six-week trial the jury returned verdicts awarding the plaintiffs compensatory damages on their design defect claims, found that the defendants had provided inadequate warnings but awarded no damages on that claim because the plaintiffs failed to prove causation, and declined to award punitive damages.
The defendants appealed from the judgment, and the plaintiffs cross-appealed. The Supreme Court of Connecticut transferred the appeal and cross-appeal from the Appellate Court to itself pursuant to Practice Book § 4023 and General Statutes § 51-199(c). Electric Boat followed a regular maintenance program involving daily inspection of tools. It purchased chucks and other replacement parts from outside vendors. It periodically removed certain safety features and used longer burr attachments on the tools.