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  • Parker, J. A.; Riccitiello, S. R.
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    Flexible Fire Retardant Polyisocyanate Modified Neoprene Foam.
    National Aeronautics and Space Administration, Los Altos, CA
    U.S. Patent 3,772,220
    U.S. Patent 3,772,220
    November 13, 1973
    3 p.