Poulsen's patent specifications for method of recording and reproducing sound or signals
name: label: Collection Creator
content: Hammer, William J. (William Joseph), 1858-1934 (electrical engineer)
setName: label: See more items in
content: William J. Hammer Collection
label: See more items in
content: William J. Hammer Collection / Series 3: Reference Materials / 3.12: Poulsen: Telegramaphone / Identified Articles
unitdate: label: Date
content: Nov. 13, 1900
container: label: Container
content: Box 56, Folder 1
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials