From the Print Room marked with a date stamp.
| Identifier | ExFiles\Box 14\7\ Scan041 | |
| Date | 12th July 1930 | |
| ROLLS-ROYCE LTD PRINT ROOM 12 JUL 1930 DERBY. | ||
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).