| Year | 1952 |
| Date | 28-Aug |
| Volume | 107 |
| Issue | 2,675 |
| Page | 269 |
| Category | Electronic |
| Part | |
| Title | The Mechanics of Radio Control |
| Author | Raymond F.Stock |
| Notes | Simple four position escapement, six-step claw mechanism geometry, escapements, geared-up escapement shaft, four-step claw arranged for eight positions, battery access hatch, selectors, reversible shaft rotation, complete steering unit |