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| Rotovator (Momentum exchange tether, an alternative name for a tether propulsion apparatus, a proposed method of lifting materials into orbit using a very long tether attached to a geo-stationary satellite AllaR) | |||
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| Rotovator (Momentum exchange tether, an alternative name for a tether propulsion apparatus, a proposed method of lifting materials into orbit using a very long tether attached to a geo-stationary satellite AllaR) | |||