| Year | 1930 |
| Date | 06-Nov |
| Volume | 63 |
| Issue | 1,539 |
| Page | 456 |
| Category | Exhibition |
| Part | |
| Title | What Some Inventors Have Been Doing . International Exhibition of Inventions. Inventions in the Trade Section |
| Author | |
| Notes | Drills and hole saws worked by ratchet brace, "jack in the funnel", improved alumina process |