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Conceived by Max Mathews, built by Robert Boie at Bell Telephone Laboratories in 1987, the Radio Baton allows a musician to control a musical performance by moving two wands, each containing a different low-frequency radio transmitter, over a flat surface that contains receivers. Each wand produces information relating to height and position relative to the left/right or top/bottom of the surface.

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The photo at the left, by Patte Wood, shows Max Mathews playing the Radio Baton in 1992.

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