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Hotchkiss for their own use and behoof, and for the use and behoof of their legal representatives, to the full end and term for which said Letters Patent may be granted as fully and entirely as the same would have been held and enjoyed by me had this Assignment and sale not been made." On verso is a Manuscript DS: "Saml. Said rights are to be held and enjoyed by the said E.W. Hotchkiss, the entire right, title and interest of every character in and to the said invention and Letters Patent for use in District and Alarm Telegraphing only, reserving to myself the exclusive right to use the said invention for business and commercial telegraphing and electro mechanical purposes. Now this Indenture Witnesseth, that for and in consideraton of the sum of one dollar to me in hand paid, the receipt whereof is hereby acknowledged, I have assigned and sold, and by these presents do transfer, convey and set over, unto the said Elisha W. Hotchkiss, of the City and State of New York are desirous of acquiring a certain right in said invention and in any Letters Patent that may be granted for the same. Edison, of Newark, in the County of Essex and State of New Jersey, have invented an Improvement in District and Alarm Telegraphs for which I have executed papers of like date herewith to be filed as a Caveat in the U.S. THE DISTRICT TELEGRAPH IS ONE OF THE SUBJECTS IN THIS PATENT. He worked on and completed the motograph, automatic telegraph system, duplex, quadruplex, sextuplex and multiplex telegraph systems.IN 1874, HE INVENTED THE DISTRICT TELEGRAPH SIGNAL BOX. The year of this document marked the start of a four-year period during which Edison conducted the manufacturing of telegraphic instruments for Western Union Telegraphic Co. His years at Newark (1870-1876) were characterized by a number of telegraph patents and partnerships. With the $40,000 he gained from selling some of his stock ticker inventions he was able to establish his Newark, NJ laboratory. He had also been involved in the improvement of the stock ticker. At the time of this document, Edison was immersed in devising inventions for the use and improvement of the telegraph. New York, 1872 January 17.The 24-year-old inventor sells the rights to his invention of an improvement in District and Alarm Telegraphs. Edison," and on a 5-cent Revenue Stamp bearing George Washington's likeness "TAE/Jan 17/1872", 1p, 8½x14. EDISON.Partly printed historic Manuscript DS: "T.A.