Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11110675 | Tire building drum and a method for using it | Evert Doppenberg, Martin De Graaf | 2021-09-07 |
| 8881785 | Tyre building drum with turn-up mechanism | Martin De Graaf, Antonie Slots, Gerrit Mulder, Jan Kornelis Grashuis | 2014-11-11 |