| Year | 1955 |
| Date | 03-Nov |
| Volume | 113 |
| Issue | 2,841 |
| Page | 651 |
| Category | Beginners' Workshop |
| Part | |
| Title | Selection and use of files |
| Author | Geometer |
| Notes | File sections, for use on flat surfaces, the right length, avoiding scratches, sections of the most common files |