TECHNICALIA

• Acoustic or mechanical telephones

• Alphabetic STD codes in Britain decoded

• The first automatic exchanges in Britain  (long before Epsom and 1912)

• 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, French

• Manufacturer codes and markings, German

• Numbering: an introduction

• Numbering: UK automatic exchange numbering schemes 1912-1966

• How the Octothorpe (# symbol) got its name

• PAX's - 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, dependents and reliefs

• Strowger or SXS switching - how it works

• Transit exchanges and STD.

• Trunk subs - what are or were they?

• Unusual telephones and related apparatus

• US military equipment codes