348 N.E.2d 127 DUFF TRUCK LINE, INC., APPELLANT, v. PUBLIC UTILITIES COMMISSION OF OHIO, APPELLEE. No. 75-949Supreme Court of Ohio. Decided May 12, 1976. Public Utilities Commission — Common carrier — Legality of tariff — Inquiry by commission — Scope — Commission rule-making powers — Discretionary. APPEAL from the Public Utilities Commission. In June 1973, […]