The identifiers after each name give the site at which the member works or worked as follows:
| Key to Entries | In Service | Retired/Resigned |
|---|---|---|
| The Marconi Company | W1 | W2 |
| Marconi Marine staff | M1 | M2 |
| Marconi Marine Radio officers | RO1 | RO2 |
| Marconi Instruments | I1 | I2 |
| Cable and Wireless | C1 | C2 |
| Other Associated organisations | O1 | O2 |
Dates
The dates shown in the lists are those when the person joined Marconi.