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HP Overlays Question
03-01-2021, 03:30 PM
Post: #1
HP Overlays Question
Does anybody know what material that the original HP-41, 71B, etc. overlays are made of?

My Collection: 55, 67 (Teenix Mod), 15C, 16C, 41CV, 41CX, 41-CL, DM41X, DM42, 42S, 48G, 71B, 75C, 95LX, HP-150, Portable+, HP-86, Integral PC.
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03-01-2021, 07:04 PM
Post: #2
RE: HP Overlays Question
Lexan (polycarbonate). You can see any number of companies that make lexan overlays with a web search:
https://duckduckgo.com/?t=canonical&q=le...lay&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.

http://WilsonMinesCo.com (Lots of HP-41 links at the bottom of the links page, http://wilsonminesco.com/links.html )
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