Word: radars
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Dates: during 1943-1943
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Promika has not yet successfully supplanted mica except for most types of radio condensers. But with literally billions of those needed for radar, walkie-talkies, inter-communicators, etc., this is a huge step forward. Natural mica "fails" at lower temperatures than Promika. Moreover, 1 lb. of Polectron replaces 10-15 lb. of natural block mica (on which rejects and wastage are very high), thus costs less than Indian mica...