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).
Resonant silencer and patent agreements with General Motors.
| Identifier | ExFiles\Box 152\3\ scan0319 | |
| Date | 30th October 1940 | |
| Rm.{William Robotham - Chief Engineer} dlt Silencer 1297 NW.{N. Walker - Patents}4/VL.{V. Lewis / Mr Valentine}30.10.40. Resonant Silencer. Referring to your Rm.{William Robotham - Chief Engineer}9/ML.28.10.40; we send herewith a copy of Patent No.423659 as requested. We have a licence agreement with General Motors under which we have to pay a royalty in respect of their patents 391180 and 417935. We believe it has been agreed that our own patent comes within the scope of one or both of these General Motors patents. N.W. [Signature] We also attach the two G.M. specifications which please return. | ||