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 cover sheet for a 40mm Barrel Mark III.
| Identifier | ExFiles\Box 176\3\ img217 | |
| Date | 1st August 1940 guessed | |
| ORDER N⁰ 138056- 30 OFF 138059- 30 OFF 17/K Rolls Royce 3 5/16" 11 63 1/8" 63 40 M/M BARREL MK III DRG. N⁰ Q.1712. WEIGHT | ||