From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint graph showing a 'closing' curve.
| Identifier | ExFiles\Box 179\2\ img237 | |
| Date | 8th February 1929 guessed | |
| V1298 CLOSING | ||