Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4527220 | Multiphase switchgear for high voltages | Rintje Boersma, Marius F. F. van Wijnandsbergen, Pieter Marien | 1985-07-02 |
| 4184058 | Polyphase isolator switches | Pieter Marien, Marius F. Fierst van Wijnandsbergen | 1980-01-15 |