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 diagram for a modified exhaust cut-out, designated S.S.
| Identifier | ExFiles\Box 14\6\ Scan090 | |
| Date | 11th July 1929 guessed | |
| MODIFIED EXHAUST CUT OUT. S.S. SCHEME 1167. | ||