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2 thoughts on “Voice Silencer on telephone lets you talk in secret”
This is actually a historically important device: it’s called a Hush-A-Phone. Back in the bad old days when you got all your phone equipment from The Phone Company, it wasn’t quite clear whether this sort of thing (attaching a third-party device to a telephone) was legal. An AT&T lawyer saw an ad for it in a window and decided to sue. They lost on appeal, clearing the way for Makers to hook up whatever they wanted to their phones.
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