Statements (13)
Predicate | Object |
---|---|
gptkbp:instanceOf |
telephone switch
|
gptkbp:developedBy |
gptkb:Bell_Labs
|
https://www.w3.org/2000/01/rdf-schema#label |
No. 4 Crossbar switch
|
gptkbp:introducedIn |
1943
|
gptkbp:relatedTo |
gptkb:No._5_Crossbar_switch
No. 1 Crossbar switch |
gptkbp:replacedBy |
electronic switching systems
|
gptkbp:technology |
electromechanical
|
gptkbp:usedBy |
gptkb:AT&T
|
gptkbp:usedFor |
long-distance telephone switching
|
gptkbp:usedIn |
gptkb:United_States
|
gptkbp:bfsParent |
gptkb:No._4_ESS_switch
|
gptkbp:bfsLayer |
6
|