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Collection
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Maker
- The General Electric Company Limited 18
- Hirst Contact Lens Limited 17
- The Siemens and General Electric Railway Signal Company Limited 15
- General Railways Signal Company 13
- The Westinghouse Brake and Saxby Signal Company 12
- Cooke, Troughton and Simms Limited 11
- Venner Time Switches Limited 10
- Royal Air Force 9
- ShieldsUp 9
- W Watson and Sons Limited 9
- New Zealand Rail 8
- Prusa Research 8
Classification
- Tools & Equipment for Science & Technology 1526
- Electrical & Magnetic T&E 404
- Electrical System Components 290
- Medical & Psychological T&E 258
- Medical Instruments 166
- Energy Production T&E 116
- Power Producing Equipment 110
- Maintenance T&E 109
- Electrical & Magnetic Measurement Devices 109
- Instrument, Electrical 97
- Optical T&E 96
- Surveying & Navigational T&E 86
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