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).
Acknowledgement of receipt for a main filter removed from a Phantom III.
| Identifier | ExFiles\Box 144\1\ scan0260 | |
| Date | 13th November 1936 | |
| 1225 S/W Rm.{William Robotham - Chief Engineer} C18/C13.11.36 Rm{William Robotham - Chief Engineer}39/R10.11.36 ------- I beg to acknowledge receipt of the main filter removed from the Phantom III. C. | ||