Grebennikov Technology - Demonstration - Part 4/4
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Video taken from: , courtesy of Altair Research Group
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![Гравитоплан Гребенникова - технология НЛО? [VipScience]](https://sun9-59.userapi.com/l2BEgUOJA_m4aJ0q4R3qcPj59eTgrJxE2J6Egg/YjqN2JzPQs0.jpg)
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