HP Overlays Question - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: Not HP Calculators (/forum-7.html) +--- Forum: Not quite HP Calculators - but related (/forum-8.html) +--- Thread: HP Overlays Question (/thread-16396.html) |
HP Overlays Question - twoweims - 03-01-2021 03:30 PM Does anybody know what material that the original HP-41, 71B, etc. overlays are made of? RE: HP Overlays Question - Garth Wilson - 03-01-2021 07:04 PM Lexan (polycarbonate). You can see any number of companies that make lexan overlays with a web search: https://duckduckgo.com/?t=canonical&q=lexan+overlay&ia=web 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. |