Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B64
AIRCRAFT; AVIATION; COSMONAUTICS
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B64U
UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
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70/00
Launching, take-off or landing arrangements
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B64U70/80
Vertical take-off or landing, e.g. using rockets
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B64U70/83
using parachutes, balloons or the like
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