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A jazz musician named Teri Pall invented a version of the cordless phone in 1965 but could not market her invention, as its 2-mile (3.2 km) range caused its radio signals to interfere with aircraft communications. In 1968, she sold her rights to the cordless phone to a manufacturer who modified it for practical use.
After three years, in 1970, another engineer Ames E. Joel invented automatically operated call handoff technology. This system allowed the mobile phones to pass through cell areas while making a phone call without any loss of conversation.