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Metallurgy is the science of the production and the processing of different metals and other metallurgic usable elements.
15
votes
Accepted
Unknown metal-piece connected to the case of an iPod Nano 2
It's a naked piezoelectric buzzer.
Some piezoelectric crystal grown on a metal circle are the active part and the bottom contact glued on the back cover.
The top is then metallised to get the second c …