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 drawing of a corrugated or concertina-like component with dimensional annotations.
| Identifier | ExFiles\Box 131\4\ scan0293 | |
| Date | 12th June 1937 guessed | |
| 9/16", FULL 9/16" | ||