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Subject: Voice frequency telegraph
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Photographs of Voice Frequency Telegraph Equipment
UK0108 NAEST 003
1927-1936
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Voice Frequency Generator and Battery Supply
UK0108 NAEST 003/1
1936
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Voice Frequency Telegraph Detector
UK0108 NAEST 003/2
1936
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Voice Frequency Telegraph
UK0108 NAEST 003/3
1936
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Photographs of Voice Frequency Telegraph Installation
UK0108 NAEST 003/4/A-B
1932-1933
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Switchboard Inspection - Penang Switchboard positions
UK0108 NAEST 003/5
1928
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Trunk Operators Positions
UK0108 NAEST 003/6
1928
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'B' Switchboard Positions
UK0108 NAEST 003/7
1927-1928
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