Metal master definitions

Metal master

1) Character created by Stan Lee
Found on https://www.crosswordclues.com/clue/metal-master

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metal master

(from the article `compact disc`) ...material that dissolves where it is exposed to laser pulses, forming the pits. This `glass master` is coated with a thin layer of nickel to form a ...
Found on http://www.britannica.com/eb/a-z/m/78

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