Struers Inc., Cleveland, Ohio, a manufacturer of equipment and consumables for metallographic specimen preparation of solid materials, has been chosen by Praxair Surface Technologies to meet the company's needs for complete lines of cutting, mounting, grinding and polishing equipment and related consumable products. The working arrangement between Struers and Praxair provides for a centralized data system, resulting in tighter control of the purchasing function from all Praxair Surface Technologies locations.