Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5050687 | Compression-vacuum action percussive machine | Vitold A. Kezik, Igor S. Agafonov, Jury N. Kolgan, Boris G. Goldshtein, Igor Nikolaev | 1991-09-24 |
| 4991664 | Compression-vacuum percussive action machine | Jury N. Kolgan, Nikolai M. Kirjushin, Vitold A. Kezik, Evgeny I. Ryabokon | 1991-02-12 |