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| Type | Company |
| Location | Chelmsford (United Kingdom) |
| Founding | 1963 |
| Industry | Electrical Industry |
| Subsidiary | Marconi Instruments, Ltd. |
| Subsidiary | GEC Marconi Defense Systems, Ltd. |
| Subsidiary | GEC Marconi Avionics, Ltd. |
| Preceeding org. | Marconi’s Wireless Telegraph Company Ltd. |
| Preceeding org. | General Electric Company |
| Succeeding org. | Marconi plc |
| Holdings | Newspaper clippings: 1969-1997 |
| Signature | A22 G 312 |
| includes | GEC Marconi Electronics, Ltd. (-1999, GND 308237-4); Marconi Communications; Marconi Company Ltd. (1963-1987, GND 64373-7); Marconi Electronic Devices |
| URI | https://pm20.zbw.eu/folder/co/058327 |
| ID | co/058327 |