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A keyer is an electronic device used for signaling by hand, by way of pressing one or more switches.The technical term keyer has two very similar meanings, which are nonetheless distinct: One for telegraphy and the other for accessory devices built for computer-human communication:
* For radio-telegraphy, the term "keyer" specifically refers to a device which converts signals from an "iambic" type or "sideswiper" type telegraph key

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