Statements (19)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:telecommunications_company
|
| gptkbp:abbreviation |
gptkb:DDD
|
| gptkbp:category |
Telephony
Telecommunications history |
| gptkbp:enables |
Long-distance telephone calls without operator assistance
|
| https://www.w3.org/2000/01/rdf-schema#label |
Direct Distance Dialing
|
| gptkbp:introducedIn |
gptkb:United_States
gptkb:Englewood,_New_Jersey 1951 |
| gptkbp:regulates |
gptkb:Federal_Communications_Commission_(FCC)
|
| gptkbp:relatedTo |
Direct Inward Dialing
Operator-assisted calling |
| gptkbp:replacedBy |
Manual long-distance calling
|
| gptkbp:requires |
Touch-tone or rotary dial telephone
|
| gptkbp:usedBy |
Telephone subscribers
|
| gptkbp:uses |
Area codes
Numbering plan |
| gptkbp:bfsParent |
gptkb:DDD
|
| gptkbp:bfsLayer |
6
|