Although this book is concerned primarily with the contractual liability of sellers of goods and with the liability in tort of manufacturers, we include here reference to other persons who may incur liability for defective products. The contractual liability of persons other than sellers has already been noted. Persons other than manufacturers who may incur liability in tort include retailers and persons who hire out or provide services involving the use of a product; donors and gratuitous bailors; wholesalers and importers; those who repair, service, recondition, assemble, install, or carry out work on a product; and probably also such persons or bodies as inspectors, engineers, testing agencies, and endorsers or certifiers of safety or quality. Finally, reference is made to the position of building contractors and builder-vendors. The discussion generally assumes that the claimant is suing in respect of personal injury or perhaps property damage, rather than economic loss simpliciter.