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 showing four different designs for model frame crosses.
| Identifier | ExFiles\Box 94\4\ scan0055 | |
| Date | 3rd June 1935 guessed | |
| B.B. 1 A B A A.A. 2 3 4 SCALE 1/2 MODEL FRAME CROSSES HS.{Lord Ernest Hives - Chair} 2003. | ||