31.   Airlines regularly take planes out of service to perform ultrasonic tests for metal fatigue or wear and tear on composite materials made of fibers and glue.

32.   Also, a number of industrial or professional groups are performing tests, sponsoring research or conducting seminars on the phenomenon.

33.   All tests were performed several times over an identical course to ensure accuracy and repeatability.

34.   But he said they did not typically perform the tests required to certify that the cables were correctly made.

35.   But Schwartzberg said he could not learn if any medical tests were performed as part of the treadmill.

36.   But scientists perform specialized tests on possible meteorites, examining their crystal structure and pinpointing their composition to rule out earthly copycats.

37.   But such tests are not performed randomly, and a drug user might pass one by ceasing drug usage several days in advance.

38.   But when it actually performed the tests last October and this January, each flight had but one decoy balloon.

39.   By midmorning, the carotid dye test had been performed and the essential fact was known.

40.   Cholestech is the manufacturer of a new device that performs multiple tests from a single drop of blood.