Telecommunications Device for the Deaf (TDD) In 1963, Robert Weitbrecht developed a large acoustic coupler. This device has helped with breaking down the communication barrier between the Hearing and Deaf communities. This device today is called the TTY, which is short for Teletypewriter. Today, most people who use these machines call them TDD, which is short for Telecommunications Device for the Deaf. TTY and TDD are names that are interchangeably used. This is a picture of what the typical TDD machine looks like today. The TDD machine operates much like an Internet chat program and has aided the ....

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