If these white goods are replaced at the end of their useful lives with efficient devices, energy use could be cut by 19%.

But when Clyde opened the case, an efficient listening device was disclosed.

Add to this the fact that paranoia is a remarkably efficient narrative device.

Mr. Travis was among the experts who said new, more efficient devices often pay for themselves.

She felt nothing and the beam wasn't affecting her vision, but it was an efficient device.

I don't think that anybody has done more about the so-called sub-electronic field than to make a nice, efficient driving device out of it.

It doesn't cost much to make a more efficient device: sometimes just 50 cents a unit, they say.

The result is a much more efficient, smaller, and lighter device.

He has some device even more efficient at extracting blood than my syringe.

The independent information leads to vastly more sensitive and efficient devices.