Telephonic or Electro-Harmonic Telegraphs, December 11, 1877
Item
- Title
- Telephonic or Electro-Harmonic Telegraphs, December 11, 1877
- Author
- Thomas A. Edison
- Date Executed
- 1876-04-03
- Date Filed
- 1876-04-06
- Date Issued
- 1877-12-11
- Type
- Patent Issued
- Subject
- Telegraphy and Telephony
- Document ID
- PAT198089
- 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