P's husband, Markus, served in the Air Force as an auto mechanic from 1971 to 1986. He died of lung cancer in 1991. P sued forty-eight asbestos manufacturers, alleging her husband's death had been caused by his occupational exposure to asbestos-containing products. P's claims were based upon market share and alternative liability. Ds moved for partial summary judgment requesting dismissal of the market share and alternative liability claims. The court dismissed those claims, and P appealed.