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Maker
- The Siemens and General Electric Railway Signal Company Limited 15
- General Railways Signal Company 13
- The Westinghouse Brake and Signal Company 12
- The General Electric Company Limited 11
- Venner Time Switches Limited 10
- Allgemeine Elektricitats Gesellschaft 8
- Ferranti Ltd. 8
- IBM 8
- QELEQ Limited 6
- Qeleq 6
- A & T Burt Limited 5
- Crompton Parkinson Limited 5
Classification
- Electrical & Magnetic T&E 421
- Tools & Equipment for Science & Technology 421
- Electrical System Components 295
- Electrical & Magnetic Measurement Devices 121
- Instrument, Electrical 108
- Switch, Electrical 74
- Relay 54
- Meter, Electric 44
- Box, Electrical 38
- Box, Control 25
- Tube, Electrical 17
- Transformer 16
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