Jerry
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John, King of England (John Lackland Plantaganet)
Magna Carta (1215)
The Commons
Types of Commons
Infrastructure
Communications Gear
Telephony
PSTN (Public Switched Telephone Network)
Telephone Exchanges
Attachments
Telephone exchange
Parents
PSTN (Public Switched Telephone Network)
Switches (telecom)
Telephones (1876)
Children
Class-5 Telephone Switches
Strowger (Stepping) Switch
Switchboard Operators
Telephone Switchboards