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).
The receipt and marking of tungsten contacts from two different suppliers.
| Identifier | ExFiles\Box 35\5\ scan 170 | |
| Date | 1st January 1921 | |
| X.2894 EFC. from RHC.{R. H. Coverley - Production Engineer} RHC{R. H. Coverley - Production Engineer}4/LGS.1.21. X.2894. RE TUNGSTEN CONTACTS. Herewith please receive tungsten contacts. Those from the Tungsten Mfg. Company have been marked 2 and those supplied by the Fan Steel Product Company have been fitted to blades and screws and marked 3 as instructed by you. [STAMP: RECEIVED JAN 2 1921] RHC.{R. H. Coverley - Production Engineer} [Signature] | ||