WILKINS, J.
The plaintiffs hold several patents on a design for a portable, hand-pumped, dry chemical fire extinguisher. The fire extinguisher is made of plastic and is operated by a built-in bellows rather than being pressurized. To be marketed successfully such a product must have the approval of a recognized independent testing organization such as the defendant (Factory Mutual). The plaintiffs contend, on several theories, that Factory Mutual is liable to them...
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