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A Teledex (short for Telephone Index) is physical device for storing telephone numbers. It is now mostly superseded by electronic methods, but I still have one.
It consists of a plastic box containing paper pages of alphabetically ordered phone listings by name.
The side of the box has alphabetical buttons which, when pressed, engage a spring mechanism which flips the lid open to the desired page.
Slimline and very portable and fast for its era (1960s-1990s?).
Bigger than a mobile phone, smaller than an iPad.
The word Teledex seems to have been taken over by a manufacturer of hotel phone systems.
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