employer and employee and invokes a different set of obligations than the employer’s duties to its employee, there is no justification for shielding the employer from liability at common law. [¶] Larson declares that the decisive test of dual capacity is whether the nonemployer aspect of the employer’s activity generates a different set of obligations by the employer toward the employee. Thus, since a doctor’s obligation toward his patient arises because he undertakes to render medical treatment, if he treats an employee rather than paying another for treatment he should be liable as a doctor rather than as an employer. (2A Larson, Workmen’s Compensation Law (1976) supra, § 72.80, pp. 14-117, 14-118.) The same rule should apply, according to Larson, to a carrier which instead of paying for medical treatment, directly performs such services. (Larson, Workmen’s Compensation Insurer as Suable Third Party (1969) Duke L.J. 1117, 1136.)” (D’Angona v. County of Los Angeles, supra, 27 Cal.3d 661, 666-667.)
The Dupree and D’Angona rationale, declared to be decisive by Larson, and approved in the recent Bell case, is that if any injury arises from a relationship which is distinct from that of employer and employee and invokes a different set of obligations than the employer’s duties to its employee there is no justification for shielding the employer from liability.
The teaching of the Douglas case is that, as applied in the manufacturing-for-sale setting, such as was involved in Douglas and in the instant case, liability should not be imposed upon the designer or manufacturer of a product for his own use even though he sells one to a neighbor or a similar business, but “. . . liability clearly arises where plaintiff employee is injured in using a product designed and manufactured by his employer primarily for sale to the general public and only incidentally used in the defendant’s other activities.” (Douglas v. E. & J. Gallo Winery, supra, 69 Cal,App.3d 103, 113.) It must be noted, however, that the Douglas court expressly limited its holding and that in the Bell case the dissenting opinion of Justice Richardson, concurred in by Justice Mosk, in disapproving the Douglas rationale also quoted Professor Larson as characterizing Douglas as an “ ‘unsound [application] of the dual-capacity concept.’” (Bell v. Industrial Vangas, Inc., supra, 30 Cal.3d 268, 287-)
In the instant case there is no contention that United Grocers is a manufacturer. It is contended, and not denied, that United Grocers requested certain design modifications be incorporated in its carts—not for sale but for its own use.