| Year | 1941 |
| Date | 10-Jul |
| Volume | 85 |
| Issue | 2,096 |
| Page | 35 |
| Category | Inventions. Successful and Otherwise |
| Part | 7 |
| Title | A Magnetic Oil-filter |
| Author | B.C.J. |
| Notes | A simple test apparatus, a four-magnet magnetic oil filter for gearbox use, a single magnet filter, a combined magnetic filter and dipstick, loose sleeve type applied to a gearbox, |