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 for a Modified H.S. Choke for China.
| Identifier | ExFiles\Box 102\1\ scan0014 | |
| Date | 24th October 1929 | |
| V731. FOR ALL OTHER DIMENSIONS SEE E51760. SCALE 1/1. MODIFIED H.S. CHOKE (CHINA). .723 ±2 DIA. .350 RAD. .350 CTR. JRD 24.10.29 | ||