Aha! There’s the invisible hand. Something to think about next time you scrape a windshield.https://twitter.com/jfmurphyjfm/status/963851358964154369 …
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I googled a bit more. It's still DOT legal (but not in some states) to have thinner defroster wires in the bottom 1/3 of the windshield, but it's DOT required to have a defroster windshield blower that is effective alone. So US manufacturers just don't make them anymore.
