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Patent Office Items

1868 Scientific American  

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https://archive.org/download/crossref-pre-1909-scholarly-works/10.1038%252Fscientificamerican12141907-443a.zip/10.1038%252Fscientificamerican12161868-393f.pdf

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doi:10.1038/scientificamerican12161868-393f fatcat:dinrxx2cp5g3va2euww4wep23u
Citation

"Patent Office Items." Scientific American 19.25 (1868) 393-393