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Collection
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Collection type
Maker
- Crompton Parkinson Limited 5
- A & T Burt Limited 5
- The General Electric Company Limited 4
- Venner Time Switches Limited 4
- Ferranti 4
- Siemens Brothers and Company Limited 3
- Telegraph Works 3
- Weston Electrical Instrument Corporation 3
- Chamberlain and Hookham Limited 3
- H W Sullivan Limited 2
- Ghielmetti Company 2
- The Reason Manufacturing Company 2
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