416 N.W.2d 680 MOBIL OIL CORPORATION, a New York corporation, Plaintiff-Appellant,[†] Michael W. LEY, Secretary of the Wisconsin Department of Revenue, Defendant-Respondent. Court of Appeals of Wisconsin. No. 86-1221.Submitted on briefs September 3, 1987. — Decided October 27, 1987. [†] Petition to review pending. This petition was not decided at the time the volume went […]