41.   GM engineers also tried to save weight by using aluminum and titanium rather than steel in many parts.

42.   Meanwhile, engineers were trying to supply electricity through alternative power lines, but KPL said its resources were limited.

43.   Mexican Army engineers were trying to move boulders and tons of dirt to widen the course of the river.

44.   NHTSA engineers also are trying to develop a steering machine that would eliminate some of the driver variables.

45.   None of those seals was damaged, however, and engineers tried to devise ways to prevent such gas penetrations.

46.   On Sunday, rescuers crept gingerly through the wreckage as engineers tried to reinforce weakened parts of the building.

47.   OKLAHOMA CITY -- Rescuers creep gingerly through the building destroyed in the Oklahoma City bombing as engineers try to reinforce weakened columns that threatened to collapse around them.

48.   Rescuers on Sunday crept gingerly through the building destroyed in the Oklahoma City bombing as engineers tried to reinforce weakened columns that threatened to collapse around them.

49.   Rescuers on Sunday crept gingerly through the building targeted in the Oklahoma City bombing as engineers tried to reinforce weakened columns that threatened to collapse around them.

50.   She added that engineers were trying to fix the software problem, although she did not know how long it might take.