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Specifications of Letters Patent for Inventions and Provisional Specifications
其他書名
1879, 2601 - 2700 (1880)
出版Published and sold at the Commissioners of Patents Sale Departement, 1880
URLhttp://books.google.com.hk/books?id=m7Fv9M1JL4MC&hl=&source=gbs_api
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