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There must be ' <' and '> ' ordering operators having the same left and right input datatypes as the mergejoinable operator itself . Also such models , combining efficiency and accuracy , are ideal to be used in the early stages of the design project . Boussa started his career modeling steam generator chemistry characteristics and working on steam generator designs for future submarines and aircraft carriers . Steeve Poligadu , a manufacturing engineer with Phillbourne Manufacturing Pty. Ltd. in Merredin , Australia , works for a medium-size manufacturing organization , practicing a wide range of industrial engineering techniques , including production scheduling , quality control procedures , and design and implementation of continuous improvement methods . The governing board of Phoenix 's SHPE chapter recently convened to discuss ways to facilitate outreach to students and enhance fund-raising efforts for scholarships . And although utilities are being privatized in some of these countries , the expected benefits have not yet materialized .