| Year | 1966 |
| Date | 04-Feb |
| Volume | 132 |
| Issue | 3,290 |
| Page | 133 |
| Category | For the Schools |
| Part | 2 |
| Title | Screw Threads |
| Author | Duplex |
| Notes | Die-holders with interchangeable collets, "Duplex" die-holders, making the die-holder, the handles, keep screws, the collets, using the die-holder |