No visible sign of propulsion devices.

However, the Hall thruster was first developed into an efficient propulsion device in the Soviet Union.

Kayaking and inflatable canoe-rafts are also available for use on guided trips, while you may even want to try a hydrospeed, a personal propulsion device.

This type of propulsion device was devised more than 40 years ago at MIT.

Activation of the main propulsion device.

But before we do that, I guess our first real step would be actually figuring out a useful long ranged propulsion device.

Around him was a brightly lighted chamber crammed with various types of underwater equipment, from simple lungs to elaborate propulsion devices.

Other inventions included a centrifugal motor, a multi-radial wheel and a mechanical propulsion device.

Short-range propulsion devices, just enough to let the Tsorans gather a trophy from the animal.

White noise projectors and chemical explosives with various kinds of propulsion devices.