No. 4B toll switching system
GPTKB entity
Statements (13)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone switching system
|
| gptkbp:developedBy |
gptkb:Bell_Labs
|
| https://www.w3.org/2000/01/rdf-schema#label |
No. 4B toll switching system
|
| gptkbp:introducedIn |
1943
|
| gptkbp:location |
gptkb:United_States
|
| gptkbp:purpose |
automate long-distance call routing
|
| gptkbp:replacedBy |
gptkb:No._4A_toll_switching_system
|
| gptkbp:status |
obsolete
|
| gptkbp:technology |
crossbar switch
|
| gptkbp:usedBy |
gptkb:AT&T
|
| gptkbp:usedIn |
long-distance telephone networks
|
| gptkbp:bfsParent |
gptkb:Bell_System
|
| gptkbp:bfsLayer |
5
|