Statements (12)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
electromechanical switch
|
| gptkbp:developedBy |
gptkb:Bell_System
|
| gptkbp:function |
automatic telephone switching
|
| https://www.w3.org/2000/01/rdf-schema#label |
No. 4XB switch
|
| gptkbp:introducedIn |
1940s
|
| gptkbp:location |
gptkb:United_States
|
| gptkbp:replacedBy |
gptkb:No._5XB_switch
|
| gptkbp:technology |
crossbar switch
|
| gptkbp:usedFor |
long-distance telephone service
|
| gptkbp:usedIn |
telephone exchanges
|
| gptkbp:bfsParent |
gptkb:Bell_System
|
| gptkbp:bfsLayer |
5
|