Subversive forces have been very much at work at a time when the jet-propelled plane has annihilated time and space and national barriers.
During the last few years great strides have been made with jet-propelled aircraft.
We also have the jet-propelled wingless vehicle which in its young and immature stage was called the "flying bedstead".
He was concerned about fuel for jet-propelled aeroplanes and land-based vehicles.
At the time, people thought him a little peculiar, but since then, we have developed such things as jet-propelled aeroplanes.
Production of jet-propelled aircraft is making good progress in this country.
To begin with, we now have jet-propelled aircraft making a new demand, although it is not necessarily for fuel of the highest range.
He also told us that jet-propelled bombers would be in operation in the foreseeable future.
