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May I also mention that "invar" is a trademark for a metal alloy that can withstand a significant range of temperatures without contracting or expanding (most metals expand when heated, a few contract, IIRC).
Without invar, the front of a CRT color TV set would have to be kept at exactly the right temperature, lest the mask change size, and the beams from the three electron guns would strike the wrong color dots around the edges.
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