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).
Production note regarding the manufacture of drums from 800 existing castings for the 'H' series.
| Identifier | ExFiles\Box 85\1\ scan0073 | |
| Date | 20th April 1936 guessed | |
| These drums can be made from the 800 castings already bought. Could be brought on to production at "H" series. (without scrap) Tool cost NIL. | ||