Page "Tractor beam" Paragraph 9
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Several groups around the world tried to replicate Podkletnov ’ s gravity shielding observations.
According to R. Clive Woods, Department of Electrical and Computer Engineering, Iowa State University, those groups were not able to overcome the extremely challenging technical problems of replicating all aspects of the 1992 experimental conditions.
Woods summarised those shortcomings in the following list:
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