46 C.F.R. § 32.80-1 General requirements—B/ALL.
Title 46 - Shipping
All tank barges with hulls constructed of materials other than iron or steel, the construction or conversion of which was started prior to September 2, 1945, and to which certificates of inspection were issued prior to March 2, 1946, shall be considered the same as tank barges constructed prior to November 10, 1936.
Title 46: Shipping
PART 32—SPECIAL EQUIPMENT, MACHINERY, AND HULL REQUIREMENTS
Subpart 32.80—Tank Barges Constructed of Materials Other Than Steel or Iron
§ 32.80-1 General requirements—B/ALL.