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 patent numbers, patentees, and their corresponding titles.
| Identifier | ExFiles\Box 147\2\ scan0162 | |
| Date | 27th December 1939 guessed | |
| No. Patentee Title E.{Mr Elliott - Chief Engineer} 515,575 Societa Anonima Alfa Romeo Improvements in or relating to variable pitch Propellers E.{Mr Elliott - Chief Engineer} 515,580 Bendix Aviation Corporation Improvements in or relating to ignition systems for internal combustion engines E.{Mr Elliott - Chief Engineer} 515,611 W. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Hay, S.E. Willett, and Improvements in or relating to Rotary air or other Gas Compressors or movers or vacuum pumps Clayton Dewandre Co.Ltd. e.{Mr Elliott - Chief Engineer} 515,621 D.{John DeLooze - Company Secretary} Napier & Son Ltd. and Improvements in or relating to four-stroke cycle internal combustion engines F.{Mr Friese} B. Halford -------------------------- | ||