Word: nonconductor
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Dates: during 1940-1949
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Mica, which laymen know as isinglass, is mainly used in peacetime as a nonconductor for electrical equipment. When war hit the Far East, almost everything about mica immediately became a military secret. Reason: most high-grade mica comes from India, and without it no tank, ship or airplane would be of much use, since mica is essential for radio condensers, and there have been no acceptable substitutes...
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