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- The Siemens and General Electric Railway Signal Company Limited 8
- Radio Corporation of America Limited 6
- Allgemeine Elektricitats Gesellschaft 5
- Amalgamated Wireless Association 2
- International Business Machines Corporation 2
- General Railways Signal Company 2
- Osram-Sylvania BVA 1
- The Ken-Rad Corporation, Incorporated 1
- Collins Radio Company 1
- Cromemco 1
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