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).
Note confirming the supply of two coils complete in cases made with Bakelite X616B.
| Identifier | ExFiles\Box 61\1\ scan0093 | |
| Date | 4th April 1930 | |
| X.6011. EFC 4-4-30 Herewith 2 Coils complete in Cases made with Bakelite X616B. as per your memo. EFC2/AD 28.3.30 E.J Snook Received OK HEW | ||