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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!
This system, similar but distinct from the panel call indicator of the 1920s and automatic number identification of the 1940s, which communicated telephone numbers to machines, was the predecessor to what is now caller ID, which communicates numbers to people.