A number of children were injured in various states from blasting caps. Ps are claiming damages against six manufacturers of blasting caps and the I.M.E. on ground of negligence and conspiracy. Each plaintiff came into possession of blasting caps that were not marked and which could easily be detonated by a child. Ps alleged that each cap in question was designed and manufactured jointly or severally by the six Ds or by other unnamed manufacturers, and by their trade association, the I.M.E. Ds moved to dismiss.