[The following documents were discovered after the microfilm edition of Thomas A. Edison Papers, Part I (1850-1878) was published and were initially published in the Supplement Series in the microfilm edition of Thomas A. Edison Papers, Part III (1887-1898). To see the location of this item in the Series Notes for Part I, use the "Which Series Notes?" button.]
This folder contains patent tracings signed by Edison and James Adams pertaining to the sextuplex telegraph, along with other tracings signed by Edison and Charles Batchelor relating to the telephone.
[NS7813A], Technical Note, James Adams, Thomas Alva Edison, April 18th, 1877 1877-04-18
[NS7813B], Technical Note, Charles Batchelor, January 8th, 1878 1878-01-08
[NS7813C], Technical Note, Charles Batchelor, February 27th, 1878 1878-02-27
[NS7813D], Technical Note, Charles Batchelor, Thomas Alva Edison, January 8th, 1878 1878-01-08