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).
Blueprint detailing a modification to a Swivel Plug (PH III).
| Identifier | ExFiles\Box 96\2\ scan0279 | |
| Date | 10th December 1937 | |
| RM{William Robotham - Chief Engineer} 475 DRILL .075 DIA (ONE) MOD'N TO SWIVEL PLUG (PH III) FOR OTHER DIMENSIONS SEE E 87380 J.C.R.LEE 10/12/37 | ||