Telecommunications Device for the Deaf (TDD)

Telecommunications Device for the Deaf (TDD)&lt;br /&gt;<br /><br />
A TDD is a teleprinter, an electronic device for text communication over a telephone line. The TDD allows people with hearing or speech difficulties to receive calls as typed messages. The original concept was developed by James C. Marsters, a dentist and private airplane pilot who became deaf as an…



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