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 applications for hydraulic power transmission and variable pitch aerial propellers.
| Identifier | ExFiles\Box 147\2\ scan0147 | |
| Date | 14th December 1939 guessed | |
| No. Patentee. Title. 31449 P.M.Salerni Hydraulic power-transmission apparatus. 31553 " " " 31478 C.R.Waseige Variable pitch aerial propellers -------------------- It should be noted that it is not possible to obtain further information regarding the above until or unless the applications are completed and published. ----------------------------- | ||