What technology did Hedy Lamarr co-develop with George Antheil to defeat Nazi jamming during WWII?

Answer

Frequency hopping spread-spectrum technology

Hedy Lamarr and George Antheil developed frequency hopping spread-spectrum technology intended to rapidly change broadcast frequencies to prevent the jamming of Allied radio-controlled torpedoes.

What technology did Hedy Lamarr co-develop with George Antheil to defeat Nazi jamming during WWII?
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