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Collection
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Maker
- The Siemens and General Electric Railway Signal Company Limited 15
- General Railways Signal Company 13
- The Westinghouse Brake and Saxby Signal Company 12
- IBM 8
- Allgemeine Elektricitats Gesellschaft 7
- The General Electric Company Limited 7
- QELEQ Limited 6
- Qeleq 6
- Venner Time Switches Limited 6
- Oliver J. Nilsen (New Zealand) Limited 5
- The Union Switch and Signal Company 5
- Marconi Instruments Limited 3
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