Top Inventors at Duffield Marine All Time
Showing 1–3 of 3 inventors
| Rank | Name | Patents |
|---|---|---|
| 1 | Marshall Duffield | 5 |
| 2 | James F. Calvagna | 1 |
| 2 | Arthur J. Heiser, Jr. | 1 |
Showing 1–3 of 3 inventors
| Rank | Name | Patents |
|---|---|---|
| 1 | Marshall Duffield | 5 |
| 2 | James F. Calvagna | 1 |
| 2 | Arthur J. Heiser, Jr. | 1 |