System of Signaling
| Image |  |
|---|---|
| Description | US patent 725605 |
| Author/s |
author: Nikola Tesla |
| Publication date | April 14, 1903 |
| Language | English |
| Country of origin | |
| Wikipedia link | |
| Access work |
United States patent 725605 (Wikisource English) |
| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |