Martin Marietta

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.

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