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Hi,
Lockheed-California was carrying out studies into Earth-to-space "shuttle" vehicles for
NASA's Marshall Space Flight Center. In this proposal the three-stage recoverable
vehicle was launched by a hot-water propulsion rocket sled.
http://www.flightglobal.com/pdfarchive/view/1964/1964%20-%200493.html
Lockheed-California was carrying out studies into Earth-to-space "shuttle" vehicles for
NASA's Marshall Space Flight Center. In this proposal the three-stage recoverable
vehicle was launched by a hot-water propulsion rocket sled.
http://www.flightglobal.com/pdfarchive/view/1964/1964%20-%200493.html