Quadruplex Telegraph, February 04, 1890
Item
- Title
- Quadruplex Telegraph, February 04, 1890
- Author
- Thomas A. Edison
- Date Executed
- 1877-08-16
- Date Filed
- 1877-08-22
- Date Issued
- 1890-02-04
- Type
- Patent Issued
- Subject
- Telegraphy and Telephony
- Document ID
- PAT420594
- Has Format
- https://iiif.archive.org/iiif/edisonpatent420594/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