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were made legal, they rapidly became the preferred method of attaching modems, and the use of acoustic couplers dwindled. Acoustic couplers were still used until at least the late 1990s by people travelling in areas of the world where electrical connection to the telephone network was illegal or impractical. Many models of Telecommunications Device for the Deaf (TDD) still have a built-in acoustic coupler, which allow more universal use with pay phones

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