| |||
| 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) | |||
| |||
| 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) | |||
