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 different schemes for sequence starter motors and gears with their part numbers.
| Identifier | ExFiles\Box 64\1\ scan0296 | |
| Date | 8th August 1927 | |
| X7620 8.8.27. Sequence starter motor. (No.1 scheme). X.7620. Sequence starter gear. (No.1 scheme). X.7650. Sequence starter motor (No.2. scheme - sliding armature). 2A. Inward. X.7625A. 2B. Outward. X.7625B. Sequence starter gear. (No.2. scheme). X.7655. EFC. | ||