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).
Enclosed translation from Messrs Aubert et Duval concerning hykro steel and nitrogen hardening.
| Identifier | ExFiles\Box 146\1\ scan0159 | |
| Date | 3rd January 1937 | |
| To Rolls Royce Ltd. Derby....... to Rm.{William Robotham - Chief Engineer} 1245 Sr/Dn24/Vf.3.I.37 Referring to your Rm{William Robotham - Chief Engineer}9/R.6.12.37, Messrs Aubert et Duval have now replied as per enclosed translation with regards to hykro steel and nitrogen hardening. Sr. | ||