TECHNICALIA
· Acoustic or mechanical telephones.
· Alphabetic STD codes in Britain decoded.
· The first automatic exchanges in Britain (long before Epsom and 1912)
· Battery technology; The Yuasa NP2.3-12 Sealed Rechargeable Lead-Acid Battery
· Electronic exchange development in the UK
· Fetrons—the solid-state valves!
· Get your technical jargon right!
· Hypothetical exchanges—they did and do exist!
· Manufacturer codes and markings, British
· Manufacturer codes and markings, German
· Numbering: UK automatic exchange numbering schemes 1912-1966
· How the Octothorpe (# symbol) got its name.
· PAXs—Private Automatic Exchanges (general)
· PAX Protectorate 1—gallery of catalogue pictures and descriptions
· PAX Protectorate 2—description of individual types
· Notable private telephone networks
· Relay Automatic Company exchanges
· Satellites, mobiles, dependants and reliefs
· Signalling between exchanges
· Strowger or SXS switching—how it works
· Telephone wiring and phone sockets demystified—UK and USA.
· Trunk subs—what are or were they?
· Unusual telephones and related apparatus
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