No. 4A toll switching system
GPTKB entity
Statements (15)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone switching system
|
| gptkbp:component |
gptkb:public_switched_telephone_network
|
| gptkbp:developedBy |
gptkb:Bell_System
|
| https://www.w3.org/2000/01/rdf-schema#label |
No. 4A toll switching system
|
| gptkbp:introduced |
1943
|
| gptkbp:location |
gptkb:United_States
|
| gptkbp:predecessor |
gptkb:No._4_toll_switching_system
|
| gptkbp:replacedBy |
manual toll switching
|
| gptkbp:retired |
1976
|
| gptkbp:successor |
gptkb:No._4B_toll_switching_system
|
| gptkbp:technology |
electromechanical
|
| gptkbp:usedBy |
gptkb:AT&T
|
| gptkbp:usedFor |
long-distance telephone call switching
|
| gptkbp:bfsParent |
gptkb:Bell_System
|
| gptkbp:bfsLayer |
5
|