11.   And new mechanical devices, like the no-till drill, can plant seeds in a field covered with stubble.

12.   A-weighting the decibel level is a way of adjusting that measurement to account for the way human beings, as opposed to mechanical devices, register sound.

13.   A mechanical device lets you tilt the back of the keyboard as you can with desktop models.

14.   But because of a severe shortage of donors, surgeons are testing self-contained artificial hearts and other mechanical devices to keep patients alive until donor hearts become available.

15.   But he showed an early aptitude for making ingenious mechanical devices, such as a windmill whose sails were turned by a mouse.

16.   But using a mechanical device for aid on the course is taboo.

17.   Debugging the mechanical devices and the computers that run them has been hard enough.

18.   Democracy works, and its workings are far preferable to a mechanical device that throws out louts and sages with an idiot impartiality.

19.   Each actuator is powered by an independent hydraulic system that includes a mechanical device known as a bellcrank.

20.   Generally speaking, this class of tiny mechanical devices is known as a microelectromechanical system.