| Development of Ladder-type Laser Scanning System for 3-D Modeling of Vertical and Narrow Areas by Space-time Analysis Recent countries visiting this post |  |
 | 5 | United States |
 | 1 | Germany |
 | 1 |
| Development of Ladder-type Laser Scanning System for 3-D Modeling of Vertical and Narrow Areas by Space-time Analysis Recent countries visiting this post | |
| 5 | United States |
| 1 | Germany |
| 1 |