Telecoms Home
This section lists the subsiduary apparatus available or still in existence in the GPO at the end of the 1960's. The data comes from the Post Office Telephones, Service Instruction manuals TPSI (S.S.479A)
Click on a link to show details of what each item was and what its uses were.
H20 TSI Sheet 3B Telephone Instruments (Para 18-25)
H20 TSI Sheet 5A Plan 2 Installations With 300 Type Teles)
H20 TSI Sheet 7A Plan 5 & 5A Installations
H20 TSI Sheet 11 Plan 107 107A Installations
H20 TSI Sheet 1 (Index)
H20 TSI Sheet 1A (Record Of Amendments)
H20 TSI Sheet 8 Plan 7 & 7A Installations
H20 TSI Sheet 13A Para 1-7 Coin Boxes At Customers' Premises
H20 TSI Sheet 5A Plan 3 Installations
H20 TSI Sheet 3B Telephone Instruments (Para 26-30)
H20 TSI Sheet 1A (Table Of Corrections)
H20 TSI Sheet 8 Plan 8 Installations
H20 TSI Sheet 6 Plan 1 Installations
H20 TSI Sheet 13A Para 8-9 Coin Boxes At Customers' Premises
H20 TSI Sheet 4 Plan Installations (Para 1-5)
H20 TSI Sheet 2 Introduction
H20 TSI Sheet 8A Plan 8A Installations
H20 TSI Sheet 6 Plan 1A Installations
H20 TSI Sheet 4 Plan Installations (Para 5-6) Shows Plans To Exchange Type
H20 TSI Sheet 3 Telephone Instruments (Para 1-5)
H20 TSI Sheet 8A Plan 9 Installations
H20 TSI Sheet 6A Plan 1B Installations
H20 TSI Sheet 14 Para 10-15 Coin Boxes At Customers' Premises
H20 TSI Sheet 9 Plan 10 Installations
H20 TSI Sheet 6A Plan 1C Installations
H20 TSI Sheet 3A Telephone Instruments (Para 6-11)
H20 TSI Sheet 5 Plan Installations (Para 6-9)
H20 TSI Sheet 14 Para 16-21 Coin Boxes At Customers' Premises
H20 TSI Sheet 9 Plan 11 Installations
H20 TSI Sheet 7 Plan 2 Installations With 700 Type Teles

Picture Plan 5 or 7 Main Switching Telephone
H20 TSI Sheet 3A Telephone Instruments (Para 12-16)
H20 TSI Sheet 10 Plan 12 Installations
H20 TSI Sheet 15 Picture 700 Type Coin Box
Picture Wall Mounted Main Switching Unit
H20 TSI Sheet 7 Plan 3 Installations
H20 TSI Sheet 10 Plan 12A Installations
Picture Pre-Payment & Post Payment Boxes
H20 TSI Sheet 3A Telephone Instruments (Para 17-18)
H20 TSI Sheet 5 Plan Installations (Para 10-20)
H20 TSI Sheet 7A Plan 4 Installations
H20 TSI Sheet 11 Plan 105 105A Installations
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