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The very first Quad I ever saw was about 20 years ago, made by Keyence and used 4 mechanical gyros. I never got one of those. The second one was made by a company called Area Fifty-One Technologies and used piezo gyros. I had one of these (still have it) and have been involved with them ever since. Articles will show up as they get written. Please subscribe if you want alerts when I post things.
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