I didn't realize that Martin still had a presence in Baltimore in 1964. When did it finally move out completely?
Lockheed Martin is still there, albiet not in the way you'd think. LM manufactures the Vertical Launch Systems in Middle River for the USN. LM sold most of the airframe and thrust reverser manufacturing capability to GE in the late 1990s, so the old Martin facility is shared by Middle River Aircraft Systems ( a GE subsidiary) and Lockheed Martin.