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Sorry I spend my working life, troubleshooting, repairing, quality control both incoming and out going. Every thing we produce has a tolerance range that has to be allowed for. I would say that if a 1000 devices were built that less that 10 would be perfect and in the old days at least 10 would be so bad that they would have to be scrapped. About 20 years ago I switched to software, and I can tell you if we fixed a bug in the program we missed any where from 10 to 100 bugs. There is nothing in life that is perfect.
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