What would generally not result in strict liability for a manufacturer?

Strict liability applies to manufacturers when their products cause harm due to defects, regardless of whether negligence can be proven. The essence of strict liability is that it holds manufacturers accountable for the safety of their products as a matter of public policy, even if they exercised all due care in the manufacturing process.

When considering the options presented, properly functioning devices do not typically lead to strict liability because these products are functioning as intended and do not pose an inherent risk or defect. If a product operates correctly and fulfills safety standards, there is no basis for liability under strict liability principles.

In contrast, inherently dangerous products, defective product designs, and failures to provide adequate warnings can lead to strict liability because each of these situations poses a risk to consumers. Inherently dangerous products may be harmful by their nature, and a defective design could render a product unsafe even if manufactured correctly. General warning failures could leave consumers unaware of potential risks associated with a product, leading to liability when harm results.

Therefore, the only scenario among the choices that typically does not result in strict liability is a properly functioning device, as it does not fall under the conditions that necessitate strict liability assessment.