they patented
Past they conjugation of patent.
At least they patented something which, you know, could do useful things.
Au moins ont-ils breveté quelque chose qui pouvait faire des choses utiles.
They patented a technology that used rapidly-changing radio signals and gave it to the U.S. Navy.
Ils ont breveté une technique reposant sur les fréquences radio et l’ont offerte à la marine américaine.
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