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PatentsPlaces
United StatesEdition | Availability |
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1
Index to the CDR file listing changes issued by the United States Patent Office in the years 1973 through 1975.
1976, Research Publications, inc.
in English
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December 5, 2010 | Edited by Open Library Bot | Added subjects from MARC records. |
December 10, 2009 | Created by WorkBot | add works page |