Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10140971 | On-site speaker device, on-site speech broadcasting system and method thereof | Jingchuan Ma | 2018-11-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10140971 | On-site speaker device, on-site speech broadcasting system and method thereof | Jingchuan Ma | 2018-11-27 |