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).
List of gear parts for cyanide hardening for Phantom III and Bentley models.
| Identifier | ExFiles\Box 127\3\ scan0173 | |
| Date | 1st December 1936 | |
| 1091 Gears for Cyanide Hardening Ru / R2-12-36. P III G/box. E82925 ✓ E81570 ✓ E82903 ✓ E84800 ✓ } C/mesh & 2nd speed. (Rh{R. Hollingworth} type). Bentley Timing Gears. T54765 ✓ T54746 ✓ T58445 ✓ In print-room. T54527 ✓ | ||