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).
Four comparative designs for a window frame seal and drainage system, labelled A, B, C, and D.
| Identifier | ExFiles\Box 117\2\ scan0081 | |
| Date | 8th November 1939 guessed | |
| A.{Mr Adams} B WITH DRAIN C. D.{John DeLooze - Company Secretary} DRAIN | ||