In Rynsburger v. Dairymen's Fertilizer Coop., Inc. (1968) 266 Cal. App. 2d 269, a group of homeowners filed suit in the Orange County Superior Court against a cooperative to enjoin construction and operation of a plant for the processing of fertilizer on the ground that it constituted an enjoinable nuisance. Proceedings in the suit remained inactive for a period. Meanwhile, two municipalities in which the plant was situated brought suit in the San Bernardino County Superior Court against the cooperative to abate its operations as a public nuisance. Following a lengthy trial, the San Bernardino Superior Court entered a detailed decree in favor of the plaintiff municipalities, requiring the cooperative to take steps to minimize the adverse effects of its operations on those living nearby. The San Bernardino trial court retained jurisdiction over the cause in order to ensure the cooperative's operations were in conformity with the relief granted. Evidently dissatisfied with the decree in the San Bernardino suit, the homeowners reactivated their Orange County litigation. But when that matter was set for trial, the cooperative obtained an order to show cause in the San Bernardino County Superior Court to restrain the homeowners from pursuing the Orange County litigation. Equitable relief enjoining the Orange County suit was entered and the homeowners appealed. Affirming the injunction against a continuation of the Orange County proceedings, the court of appeal said this: "The propriety of injunctive relief to prevent conflicting or vexatious litigation has long been established in our law. Where there exists two or more actions involving the same subject matter or the same facts or principles, restraint is necessary to prevent a multiplicity of judicial proceedings. . . . In summary, the San Bernardino Superior Court's action in restraining the Orange County suit was fully justified since . . . it was empowered to make such orders as necessary to prevent impairment of its judgment and to avoid . . . vexatious litigation." (266 Cal. App. 2d at p. 279.)