10/11/1892 Randolph, John F and Edison, Thomas Alva to Butler, Thomas
(Columbia Phonograph Co [supplied or conjectured]; Lombard, Thomas R [supplied or conjectured]) Competition and market structure; Cylinder phonograph
[LB053]  General Letterbook Series: LB-053 (Oct 1891-Oct 1893)
[LB053348; TAEM 142:932]
Courtesy of Thomas Edison National Historical Park.