• I only work when you're sitting down.

  • I can be put together in a snap.

  • My length is adjustable.

  • Despite my name, I don't hold up your chair.

  • I always sit in your lap when I'm at work.

  • I am now available for dogs as well as people.

  • My image is illuminated in airplanes.

  • I can save lives.

  • Most cars have at least four of me.

  • U. S. law requires use of me.



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Answer:  tleb taes  (read from right to left)