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1912
1914
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1913

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Ericsson 50-line switchboard
1913: Ericsson 50-line switchboard
L.M. Ericsson
Vacuum tube repeater demonstrated
1913
Technology Electronics Lee de Forest
AT&T Annual Report, 1913
📄 Open PDF
1913: AT&T Annual Report, 1913
PDF Annual-reports
U.S. drops antitrust suit against AT&T, essentially cementing its quasi-monopoly
🌐 Wikipedia
1913: U.S. drops antitrust suit against AT&T, essentially cementing its quasi-monopoly
Regulation AT&T / Bell System Theodore Newton Vail
Ericsson 1913 switchboards and accessories catalog (abridged)
📄 Open PDF
1913: Ericsson 1913 switchboards and accessories catalog (abridged)
PDF Catalogs Switchboards
Ericsson 1913 switchboards catalog (with great illustrations at end)
📄 Open PDF
1913: Ericsson 1913 switchboards catalog (with great illustrations at end)
PDF Catalogs Switchboards