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 patents related to improvements in variable and two-speed change gears.
| Identifier | ExFiles\Box 147\1\ scan0206 | |
| Date | 31th May 1937 guessed | |
| No. Name of Patentee. Title 465,091 Alois Wicha Improvements in or relating to Continuously variable Mechanical Change-speed Gears. 465,110 Edouard Goumain Improvements in Continuously variable Change speed gears. 465,132 Kollmann-Werke A.G. Improvements in Two speed change gear for Power Vehicles. | ||