| The acoustic vector-sensor's near-field array-manifold Recent countries visiting this post |  |
 | 5 | United States |
 | 1 | China |
 | 1 | Russian Federation |
| The acoustic vector-sensor's near-field array-manifold Recent countries visiting this post | |
| 5 | United States |
| 1 | China |
| 1 | Russian Federation |