The return of the Sheriff upon process or notice is prima facie evidence of the facts stated in the return. (GC 26662) Thus, a certificate of service that a partnership was served by service on a named person as one of the partners is prima facie evidence that such person was a partner. (Row v. Spring Hill Quartz Mining Co., 10 CA 445) The return on a summons against a corporation is prima facie evidence that the person named therein as an officer or agent is such officer or agent. (Eclipse Fuel Engineering Co. v. Superior Court, 148 CA 2d 736)