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Subject: Duplex telegraphy

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UK0108 SC MSS 005/I/1/01

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UK0108 SC MSS 005/I/1/12

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UK0108 SC MSS 005/I/1/13

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Provisional specification for Fahie's system of duplex telegraphy, No. 433 with notes

UK0108 SC MSS 009/1/11

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Als from Fahie to E J Douglas Walker

UK0108 SC MSS 009/1/12

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'Improvements in electric telegraphic circuits'

UK0108 SC MSS 009/1/16

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Robert Sabine correspondence

UK0108 SC MSS 009/2/123

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Siemens Bros correspondence

UK0108 SC MSS 009/2/127

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Duplex translator morse

UK0108 NAEST 069/1/050

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Morse duplex terminal

UK0108 NAEST 069/1/051

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Indicator dial flags

UK0108 NAEST 069/1/052

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Connections for double morse circuit - Santa Fe and Codova Extension Railway

UK0108 NAEST 069/1/072

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Double current working morse set - intermediate station

UK0108 NAEST 069/1/119

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Double current duplex-simplex telegraph set for terminal station, with instructions

UK0108 NAEST 069/1/174

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Diagramatic connections - double current terminal stations

UK0108 NAEST 069/1/175

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