Statements (18)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
telephone switch
|
| gptkbp:developedBy |
gptkb:Western_Electric
|
| gptkbp:feature |
busy lamp field
intercom hold function lamp signaling multiple line appearance |
| https://www.w3.org/2000/01/rdf-schema#label |
No. 1A2 switch
|
| gptkbp:introducedIn |
1938
|
| gptkbp:replacedBy |
electronic key systems
|
| gptkbp:standardizedBy |
gptkb:Bell_System
|
| gptkbp:usedFor |
business telephone systems
25-pair cable rotary dial telephones touch-tone telephones |
| gptkbp:usedIn |
key telephone systems
|
| gptkbp:bfsParent |
gptkb:Bell_System
|
| gptkbp:bfsLayer |
5
|