[PT031AAG], Patent Caveat, Thomas Alva Edison, July 29th, 1889
Full case file of Caveat 116 (May 20 1889) including typed version
Chemicals, chemical products, and chemical processes
Cylinder record and duplicating technology
[PT031AAG-F] Patent Series -- Caveat Files
https://edisondigital.rutgers.edu/document/PT031AAG
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 113