Car back glass llines

Car back glass lines

Some cars having parallel lines in rear glass.What they are ,why it should be placed here?

It is a defogger ,when rain droplets fall on the rear mirror used to evaporate the water on

the glass.Some car there is a switch on the dashboard to on the rear defogger.When rains

you just start the switch and that will switch off automatically ,when it do it's work.

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How to calculate age of tree using ring without cutting

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