Statements (13)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone switching system
|
| gptkbp:developedBy |
gptkb:Bell_Labs
|
| https://www.w3.org/2000/01/rdf-schema#label |
No. 4 toll switching system
|
| gptkbp:introduced |
1943
|
| gptkbp:location |
toll centers
|
| gptkbp:replacedBy |
gptkb:No._4A_toll_switching_system
|
| gptkbp:technology |
crossbar switch
|
| gptkbp:usedBy |
gptkb:AT&T
|
| gptkbp:usedFor |
long-distance telephone switching
|
| gptkbp:usedIn |
gptkb:United_States
|
| gptkbp:bfsParent |
gptkb:No._4A_toll_switching_system
gptkb:No._4C_toll_switching_system |
| gptkbp:bfsLayer |
6
|