Statements (21)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:communication
telegraph |
| gptkbp:category |
electrical engineering
19th-century inventions history of telecommunications |
| gptkbp:enables |
gptkb:Morse_code
|
| gptkbp:firstCommercialLine |
Washington, D.C. to Baltimore
|
| gptkbp:firstCommercialLineYear |
1844
|
| gptkbp:firstDemonstrated |
1837
|
| https://www.w3.org/2000/01/rdf-schema#label |
electromagnetic telegraph
|
| gptkbp:introducedIn |
1830s
|
| gptkbp:inventedBy |
gptkb:Joseph_Henry
gptkb:Samuel_Morse gptkb:Alfred_Vail |
| gptkbp:replacedBy |
gptkb:smartphone
|
| gptkbp:usedFor |
long-distance communication
|
| gptkbp:uses |
Electricity
electromagnetism |
| gptkbp:bfsParent |
gptkb:Ernst_Werner_Siemens
gptkb:US_Patent_1647_(Morse) |
| gptkbp:bfsLayer |
7
|