 They sometimes assist in the restoration and operation of vintage radio equipment for historical exhibits, museums, and historic ships or aircraft.Examples of this are groups of amateurs who restore, maintain, and operate the radio installations of the ocean liner "Queen Mary", the engineering heritage site Musick Memorial Radio Station, and the National Register of Historic Places listed Massie Wireless Station.Amateur restoration of historic military radios includes the B-17 Flying Fortress "City of Savannah" at the National Museum of the Mighty Eighth Air Force, the B-29 Superfortress "Enola Gay" at the National Air and Space Museum, and the submarine USS "Requin" at the Carnegie Science Center.