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A Digest of Patents, Issued by the United States from 1790 to January 1, 1839 ... To which is Added the Present Law Relating to Patents (etc.)
Henry-Leavitt Ellsworth
出版Peter Force, 1840
URLhttp://books.google.com.hk/books?id=1ZRSAAAAcAAJ&hl=&source=gbs_api
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