21.   Hard drives are mechanical devices and run thousands of times slower than chips.

22.   Hard disks are mechanical devices.

23.   In the world of mechanical devices, nanotechnology has already created billion-dollar markets for devices like ink-jet printer heads and accelerometers for automobiles.

24.   It looks instead like a strange mechanical device that was invented by a rocket scientist, and it is posted three feet above the water.

25.   John Cummings, a graduate student at the University of California at Berkeley, has conquered friction, a big headache in tiny microelectro mechanical devices.

26.   Mostly, he made up mechanical devices that he thought would be useful or that he might later turn into wooden models.

27.   Now the Americans are concerned that some skaters may show up at the starting line at the Olympics using a mechanical device that no one else has ever seen.

28.   Nowadays, Speed said, the function performed by that mechanical device would be handled by software.

29.   Other options are putting mechanical devices on police cars not assigned to highway duty to limit speed, and immediately grounding officers in accidents.

30.   Plenty of other mechanical devices have been revived too.