The turbo-mechanism and the competition for it could be one decisive clue.
Alternatively, we may imagine the processes as being somewhat idealized versions of the flows that occur in axial-flow turbo-machinery.
A turbo molecular pump, backed by a rotary vane pump is connected to the chamber.
The cell was sealed in the glovebox, removed, and then evacuated with a turbo vacuum pump to a pressure of 4 mtorr.
The cell was evacuated with a turbo vacuum pump to a pressure of 4 mtorr during most of the heating process.
The vacuum chamber was evacuated by a turbo-molecular pump.
Valves were located between the cell and the mechanical pump, the cell and the monochromator, and the monochromator and its turbo pump.
More recently "turbo spin echo" sequences have allowed single slice scans acquired in 10-15 seconds during breath holding.
