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a typically unwanted effect often characterized by high-pitched sounds. They then placed the loudspeaker on the laboratory's roof, and claims say that the amplified human voice could be heard 1 mi away. Jensen and Pridham refined the system and connected a phonograph to the loudspeaker so it could broadcast recorded music. They did this on a number of occasions, including once at the Napa laboratory, at the Panama-Pacific International Exposition,

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