Title
Voice Frequency Telegraph Detector
Reference
UK0108 NAEST 003/2
Date
1936
Scope and Content
Black and white photograph labelled B with manuscript label reading ' V[oice] F[requency] Detector MS 3515 as used extensively by B[ritish] P[ost] O[ffice] for defence teleprinter network (D.T.N.). Note bears name J Frewer and original reference 25701 BAS and initials STC [Standard Telephone and Cables]
Physical description
Number of pieces: 1
Language
English.
Persons keyword
Subject
Conditions governing access
Open
Level of description
file
