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A subject index is provided for over 4700 patents and patent applications for the period May 1969 through December 1987. Additional indexes list personal authors, corporate authors, contract numbers, NASA case numbers, U.S. patent class numbers, U.S. patent numbers, and NASA accession numbers. Unspecified Center NASA-SP-7039(32)-SECT-2, NAS 1.21:7039(32)-SECT-2 ...