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Explore Telephone Solar, Tone Telephone, and more! Dr. Shirley Jackson invented solar cell, fiber optic cables making caller id and call waiting possible, portable fax, and touch tone phone!
Cooper led a team that designed the first practical cell phone. It was called the Motorola DynaTAC, and it still wasn't a tiny device -- it was 9 inches (22.9 centimeters) long and weighed 2.5 pounds (1.1 kilograms). Cooper decided to make one of the first cellular telephone calls to professional rival Joel Engel at Bell Labs.