312 P.2d 521 MONTANA-DAKOTA UTILITIES CO., A CORPORATION, PLAINTIFF AND RESPONDENT, v. MONTANA GAS CORPORATION, A CORPORATION, DEFENDANT AND APPELLANT. No. 9315.Supreme Court of Montana.Submitted February 19, 1957. Decided May 2, 1957. Rehearing Denied July 3, 1957. CONTRACTS — GAS — EVIDENCE.1. Gas — Letter justified restriction of contract obligation. Letter written by pipe line […]