Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4674134 | Earmuff having sealing ring including liquid and foam plastic layers | — | 1987-06-23 |
| 4375702 | Device for mounting an earmuff on a helmet | — | 1983-03-08 |
| 4338929 | Ear-plug | Kalman Csiki | 1982-07-13 |
| 4215683 | Ear-plug | Kalman Csiki | 1980-08-05 |