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Thank you Guy
Yes , Therglas is the registered name of the system. And those are the exact markings I have seen before. I believe Kinon / Kinonglas is the glass manufacturer using the Therglas patented technology.
I have not been able to find it referanced. But DOT 31 , is either registered to this glass co. itself. Or a parent co. that owned it. I have a list of DOT number / to companies up to 700. But it starts at 15 ...goes to 27. Then skips 28-31 , and starts again at 32 ...all the way to 700. DOT number system starts in 1969 by the way.
For referance, I found out this heated , tinted windshield is combined with tinted side glass & tinted 2-stage rear window under option M443. Starting in 1974 model year as far as I know (this is the first year I can find it listed so far). At some much later point (mid to late 80's ?) it must been have changed to M577. This technology was developed decades earlier , but this seems to be the first Porsche use.
pht9 , if you read this . And your 1975 has the exact same markings ...please post. Or let me know whats differant if anything , if you would.
Last edited by RatBox; 09-08-2011 at 08:14 PM..
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