| Using Registration, Calibration, and Robotics to Build a More Accurate Virtual Reality Simulation for Astronaut Training and Tel Recent countries visiting this post |  |
 | 5 | United States |
 | 1 | Germany |
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| Using Registration, Calibration, and Robotics to Build a More Accurate Virtual Reality Simulation for Astronaut Training and Tel Recent countries visiting this post | |
| 5 | United States |
| 1 | Germany |
| 1 | Japan |