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HP Overlays Question
03-01-2021, 07:04 PM
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RE: HP Overlays Question
Lexan (polycarbonate). You can see any number of companies that make lexan overlays with a web search:

Our company made a product from 1995-2008 or so that used a lexan overlay because it allowed annunciators to be to be totally invisible until lights came on behind them, and then they'd pop out of the black background. (Lots of HP-41 links at the bottom of the links page, )
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HP Overlays Question - twoweims - 03-01-2021, 03:30 PM
RE: HP Overlays Question - Garth Wilson - 03-01-2021 07:04 PM

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