Telephone Directory Services
Number directories, operator assistance, business listings, updates, and printed reference infrastructure for telephone networks.
Core metadata
- ID: telephone_directory_services
- Era: Industrial
- First known date: 1878 (exact)
- Region: New Haven, Connecticut, United States
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Telephone Exchange (telephone_exchange)
- Telephone Switchboards (telephone_switchboards)
- Typewriter (typewriter)
Dependents
Fields
- None.
Node sources
- The World's First Telephone Directory (University of Connecticut Library, 2021, museum) • Supports: node
Locator: UConn identifies the New Haven District Telephone Company directory of February 21, 1878 as the world's first public telephone directory. - The first telephone book (HistoryofInformation.com, 2026, review) • Supports: node
Locator: HistoryofInformation.com describes the February 21, 1878 New Haven subscriber list as the first telephone book.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 3
- Average edge confidence: 68%
- Prerequisite sources: 2
- expert_inference: 3
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Telephone Exchange (telephone_exchange) | enabling | 68% | expert_inference | Telephone Exchange provides a capability that enables this technology without being the only possible path. |
|
| Telephone Switchboards (telephone_switchboards) | enabling | 68% | expert_inference | Telephone Switchboards provides a capability that enables this technology without being the only possible path. | No sources recorded. |
| Typewriter (typewriter) | enabling | 68% | expert_inference | Typewriter provides a capability that enables this technology without being the only possible path. |
|
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