This section lists the Misc 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)

H20 TSI Sheet 16 Faint Speech Amp, Amplifier, Louspeaker Nos 1 & 2
H20 TSI Sheet 16A Answering Set No 1, Hard Of Hearing Eqpt
H20 TSI Sheet 16A Bells & Hooters
H20 TSI Sheet 16A  Free Provision Of Bells, Buzzers In Lieu Of Bells
H20 TSI Sheet 17 Lamp Signals
H20 TSI Sheet 17A Mains Voltage Lamps, Low Voltage Lamps On 200 & 300 Type Teles
H20 TSI Sheet 18 Large Dial Rings, Lock 29A, Order Table & Speech Broadcasting Eqpt
H20 TSI Sheet 18 Speech Broadcast Working, Private Meters
H20 TSI Sheet 18A Private Meters Cont, Sender No 1 & 2, Signs For Subscribers
H20 TSI Sheet 18A Telephone Cords, Tansmitter Cut Out Facility, Watch Receiver

H20 TSI Sheet 19 Shared Service. Para 1-9
H20 TSI Sheet 19 Shared Service. Para 10-16

H20 TSI Sheet 19 Shared Service. Para 16

H20 TSI Sheet 20b House Telephone System Para 1-5
H20 TSI Sheet 20c Loudspeaking Telephones Para 1-7
H20 TSI Sheet 20c Loudspeaking Telephones Para 7-10
Picture of Magneto Bells
H20 TSI Sheet 20c (i) Louspeaking Telephones Para 11
Picture of Loudspeaking Telephone No 1
Picture of Loudspeaking Telephone No 2
Picture of Large Dial Ring
Picture of Private Clock Meter
Picture of Pendant Telephone & Dial Unit
Picture of Amplifying Handset
Picture of Klaxon Horn (Hooter No 2)
Picture of House Telephone System
Picture of Trembler Bells
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H9 TSI Private Meters On PBX's