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).
Simple pencil sketch of a diagram with four nodes.
| Identifier | ExFiles\Box 37\1\ scan 312 | |
| Date | 6th May 1927 | |
| ROLLS-ROYCE, LIMITED PRINT ROOM, -6 MAY 1927 DERBY. | ||