· The first automatic exchanges in Britain (long before Epsom and 1912)
· Battery technology; The Yuasa NP2.3-12 Sealed Rechargeable Lead-Acid Battery
· Fetrons—the solid-state valves!
· Get your technical jargon right!
· Hypothetical exchanges—they did and do exist!
· Numbering: UK automatic exchange numbering schemes 1912-1966
· How the Octothorpe (# symbol) got its name.
· Notable private telephone networks
· Strowger or SXS switching—how it works
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