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).
Confirming the filing of a specification and drawing for the Aspin Rotary Valve application.
| Identifier | ExFiles\Box 147\4\ scan0171 | |
| Date | 22th July 1941 | |
| Rm.{William Robotham - Chief Engineer} 1247 NW{N. Walker - Patents}1/MW.22.7.41. Aspin Rotary Valve. Application No. 12966/40. We send herewith a copy of the above Complete Specification which was filed on the 18th instant, together with a lettered print of the drawing. N.W. | ||