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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
On that day, April 3, 1973, Cooper needled his rival at AT&T’s Bell Labs by calling him on the 11-inch-long, 2.5-pound Dyna-TAC prototype that he and his team had begun to design only five months earlier.
Source: https://patriotpost.us/articles/95363-the-cellphone-at-50-2023-03-02