Keywords aerospace aggregates cement chemicals electronics
From Wikipedia: Martin Marietta:
Martin Marietta Corporation was founded in 1961 through the merger of The Martin Company and American-Marietta Corporation. The combined company became a leader in aggregates, cement, chemicals, aerospace, and electronics.
1995: Martin Marietta merged with Lockheed Corporation to form Lockheed Martin
1996: Lockheed Martin splits off Martin Marietta Materials as a separate and independent entity.