United States patent document for a spring design.
| Identifier | ExFiles\Box 154\1\ scan0027 | |
| Date | 7th June 1921 | |
| C. A. {Mr Adams} BROCK. SPRING. 1,380,523. APPLICATION FILED FEB. 5, 1917. Patented June 7, 1921. Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 7. Inventor Clarence A. {Mr Adams} Brock. By Chas. W. Kennell, Jr. {Mr James Royce} Attorney | ||
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).