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Decision of Hon. Philip F. Thomas, Commissioner of Patents, on the Application of Samuel F.B. Morse, for an Extension of His Patent for a New and Useful Improvement in Electro-magnetic Telegraphs
United States. Patent Office
其他書名
Patented April 11, 1846 : Patent Extended for Seven Years from the 11th Day of April, 1860
出版H. Polkinhorn, printer, 1860
URLhttp://books.google.com.hk/books?id=cg84AQAAMAAJ&hl=&source=gbs_api
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