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).
List of important designs with their corresponding reference numbers.
| Identifier | ExFiles\Box 82\4\ scan0145 | |
| Date | 22th July 1935 guessed | |
| Important Designs 20/25 - Carburetter Filter Le C.4509. 1 1/4 Speed dynamo drive. Le C.4406 Dynamo cradle & triangular stay to front expansion box Le C.4410 Flexible engine mounting. Le C.4462. Oil filter for auto tappets Le C.4503. | ||