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IIRC Ford's elements are ziz zag.

I've just had a look (with a magnifying glass) and Land Rover's are definitely an irregular wave form.

Heated screens have been around a long time. I think they were first developed for aircraft during WW2.

Here is a patent application from 1956 for a method of applying the technology to laminated glass panels of unusual configuration in aircraft and other vehicles...

Electrically heated laminated glass panels
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