"In the matter of the interference with Mr. Dickerson on your application No. 140 Sextuplex Telegraph, the Patent Office has fixed the times for closing testimony as follows:- Edison, testimony in chief to close June 7, 1888. Dickerson " " " " " 27 ### Edison " " in Rebuttal July 12. ### Hearing Aug. 1 1888" [TAE Marginalia: "My testimony must be taken here at Laboratory notify me 2 days ahead."]

Serrell, Lemuel Wright

Edison, Thomas Alva

U.S. Patent Office

Dickerson, Edward Nicoll

1888-05-08

1880-1889

Letter

Patent interference

Multiple telegraphy (duplex, quadruplex)

D8846AAV

D8846

[D8846AAV], Letter from Lemuel Wright Serrell to Thomas Alva Edison, May 8th, 1888

124:27

Thomas Edison National Historical Park

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University