| RefNo | HD/8/6/13 |
| Previous numbers | 93HD.13.11.13 |
| Level | Item |
| Title | 'How It Began: The Thermionic Valve' by Sir Ambrose Fleming FRS |
| Date | [12 October 1942] |
| Description | Script of BBC radio broadcast for Overseas Pacific Transmission on 12 October 1942 |
| Extent | 2pp |
| Format | Typescript |
| AccessStatus | Open |
| AccessConditions | OPEN - but with some restrictions |