Mangone Shipbuilding Co. of Houston, Texas, has received a contract from Astro-Marine, Inc., for the construction of an offshore, oil-well supply boat. Designated Hull No. 90, the vessel is to have the following dimensions: an overall length of 156 feet 6 inches, a beam of 36 feet and a depth of 15 feet. It will be powered with 2,400-total-bhp diesel machinery.