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Actions	Details Remove from selection Add to selection Title Modifications to London Trunk Exch[ange] Line CCT Reference UK0108 NAEST 006/6 Date 31 March 1930 Scope and Content Photostat copy of schematic drawing of modifications to the London Trunk Exchange line circuit with annotations and pencil notes on reverse, initialled JRS, drawing number 14351-1. Physical description Number of pieces: 1, Pages/folios: 1 p Language English. Subject Telephone exchanges Conditions governing access Open Level of description file Hierarchy browser 110000001 NATIONAL ARCHIVE FOR ELECTRICAL SCIENCE AND TECHNOLOGY contains 322 parts UK0108 NAEST 006 Telephone Four Frequency Signalling System contains 9 parts UK0108 NAEST 006/6 Modifications to London Trunk Exch[ange] Line CCT

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Title
Modifications to London Trunk Exch[ange] Line CCT
Reference
UK0108 NAEST 006/6
Date
31 March 1930
Scope and Content
Photostat copy of schematic drawing of modifications to the London Trunk Exchange line circuit with annotations and pencil notes on reverse, initialled JRS, drawing number 14351-1.
Physical description
Number of pieces: 1, Pages/folios: 1 p
Language
English.
Subject
Telephone exchanges
Conditions governing access
Open
Level of description
file

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