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- Venner Time Switches Limited 6
- Oliver J. Nilsen (New Zealand) Limited 5
- The General Electric Company Limited 3
- Allan Electrical Company 1
- Auckland Electric Power Board 1
- Crabtree 1
- Richmond Hill Laboratories 1
- Sangamo Weston Limited 1
- Siemens Brothers and Company Limited 1
- Truvox International Limited 1
- Western Electric Company 1
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