Speaking-Telegraph, March 07, 1893
Item
- Title
- Speaking-Telegraph, March 07, 1893
- Author
- Thomas A. Edison
- Date Executed
- 1877-08-31
- Date Filed
- 1877-09-05
- Date Issued
- 1893-03-07
- Type
- Patent Issued
- Subject
- Telegraphy and Telephony
- Document ID
- PAT492789
- Has Format
- https://iiif.archive.org/iiif/edisonpatent492789/manifest.json
- Rights
- Edison's patents are in the public domain and have been made available through the generosity of David Kovanen.
- Publisher
- The Thomas A. Edison Papers