| Year | 1951 |
| Date | 05-Apr |
| Volume | 104 |
| Issue | 2,602 |
| Page | 455 |
| Category | Test Reports |
| Part | |
| Title | Tools by Messrs Offen & Co. Ltd. |
| Author | |
| Notes | Some expert comments upon items submitted by the trade. The Offen V-blocks, surface plate test, the Offen machine vice, precision quality, squareness of jaw, at right angles, contact testing |