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| Polytechnic University of Puerto Rico--Graduate students--Research (1) |
| Quadrotor helicopters--Automatic control (1) |
| Quadrotor helicopters--Design and construction (1) |
| Polytechnic University of Puerto Rico--Graduate students--Research (1) |
| Quadrotor helicopters--Automatic control (1) |
| Quadrotor helicopters--Design and construction (1) |