Michigan Compiled Laws, Chapter 211. Taxation of Real and Personal Property § 211.30b

Sec. 30b. In 1965 only, regardless of the provisions of section 30a,  1 personal property assessments in any city, township or village shall be subject to revision, upon authorization of the state tax commission, after the final meeting of the board of review and, where any assessment is so revised, the board of review shall reconvene and, after written notice to each affected taxpayer of said meeting and of the proposed change in his assessments, review the personal property assessment roll on or before April 15, 1965, and thereafter such roll shall be treated as though the review thereof had been completed at the usual time.