| Year | 1942 |
| Date | 07-May |
| Volume | 86 |
| Issue | 2,139 |
| Page | 443 |
| Category | Division Plate Competition |
| Part | |
| Title | Drilling 17 Equally-Spaced Holes on a Circle |
| Author | C.H.Holley |
| Notes | Jig for drilling equally-spaced holes on a 5-in. circle, method of use, second method, other uses |