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In the film "It Might Get Loud," Jack White explains that while he and a luthier from Seattle named Randy Parsons were designing a guitar for the Raconteurs tour, he had the idea to have Parsons put a Green Bullet Harmonica Mic in the guitar. This would allow White to just pull the mic out of the guitar and use it onstage. At about 1:35 in this video you actually see him using the microphone.
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