Telephone Switchboards

Manual and electromechanical switching centers that connected telephone subscribers into scalable voice networks.

Core metadata

ID: telephone_switchboards
Era: Industrial
First known date: 1878 (exact)
Region: New Haven, Connecticut, United States
Review status: source_checked
Maturity: N/A

Prerequisites

Dependents

Telephone Directory Services (telephone_directory_services)

Fields

None.

Node sources

Site of the First Telephone Exchange (National Park Service, 2018, official_agency) • Supports: node
Locator: National Park Service describes the first commercial telephone exchange beginning operations in New Haven on January 28, 1878, and George W. Coy designing and building the switchboard for commercial use.

Prerequisite edge evidence

Edge/source evidence summary:

Prerequisite edges: 3
Average edge confidence: 68%
Prerequisite sources: 3
expert_inference: 3

Prerequisite	Type	Confidence	Evidence level	Note	Sources
Telephone (telephone)	enabling	68%	expert_inference	Telephone provides a capability that enables this technology without being the only possible path.	Alexander Graham Bell and the Telephone (Library of Congress, 2026, official_agency) • Supports: edge
Telephone Exchange (telephone_exchange)	enabling	68%	expert_inference	Telephone Exchange provides a capability that enables this technology without being the only possible path.	Telephone (Encyclopaedia Britannica, 2026, textbook) • Supports: edge
Electricity (electricity)	enabling	68%	expert_inference	Electricity provides a capability that enables this technology without being the only possible path.	Electrical Years: Part 1 (National Museum of American History, 2026, museum) • Supports: edge

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