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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 20b House Telephone System Para 1-5

H20 TSI Sheet 18A Private Meters Cont, Sender No 1 & 2, Signs For Subscribers

H20 TSI Sheet 16 Faint Speech Amp, Amplifier, Louspeaker Nos 1 & 2

H20 TSI Sheet 17 Lamp Signals

H20 TSI Sheet 17A Mains Voltage Lamps, Low Voltage Lamps On 200 & 300 Type Teles

Picture of House Telephone System

H20 TSI Sheet 16A Answering Set No 1, Hard Of Hearing Eqpt

Picture of Private Clock Meter

H20 TSI Sheet 20c Loudspeaking Telephones Para 1-7

H20 TSI Sheet 18 Large Dial Rings, Lock 29A, Order Table & Speech Broadcasting Eqpt

Picture of Amplifying Handset

H20 TSI Sheet 18A Telephone Cords, Tansmitter Cut Out Facility, Watch Receiver

H20 TSI Sheet 20c Loudspeaking Telephones Para 7-10

H20 TSI Sheet 16A Bells & Hooters

Picture of Large Dial Ring

Picture of Klaxon Horn (Hooter No 2)

H20 TSI Sheet 20c (i) Louspeaking Telephones Para 11

H20 TSI Sheet 19 Shared Service. Para 1-9

Picture of Pendant Telephone & Dial Unit

Picture of Trembler Bells

Picture of Loudspeaking Telephone No 1

H20 TSI Sheet 19 Shared Service. Para 10-16

Picture of Magneto Bells

H20 TSI Sheet 18 Speech Broadcast Working, Private Meters

Picture of Loudspeaking Telephone No 2

H20 TSI Sheet 16A  Free Provision Of Bells, Buzzers In Lieu Of Bells

H20 TSI Sheet 19 Shared Service. Para 16

H9 TSI Private Meters On PBX's

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