The tape is designed to increase the spreading of light in the light guide from each LED, which greatly increases the allowable LED spacing.

ENGADGET: 3M Uniformity Tape improves lighting quality on LED edge-lit LCDs, lowers production costs

Those tests apparently led the airplane builder to greatly underestimate the chances of battery failure, the safety board said.

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This frustration has led to the GOP legislative effort to greatly expand the power of such emergency appointees.

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