20kg 드론시연hk jung2020년 1월 22일1분 분량 https://www.youtube.com/watch?v=x0Fbf_-n8MA&feature=youtu.be&fbclid=IwAR0NCdJKZujrX2_ag9BbH9JF7X3yMaIeLROemCR1FtgZZTO7YzBSWQqZc1I
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