313 N.E.2d 373 PETROCON, INC., APPELLANT, v. KOSYDAR, TAX COMMR., APPELLEE. No. 73-946Supreme Court of Ohio. Decided June 19, 1974. Taxation — Severance tax — R.C. 5749.02 — Burden on party challenging constitutionality — Burden not met, when. APPEAL from the Board of Tax Appeals. Mr. John N. Teeple, for appellant. Mr. William J. Brown, […]