APPROACHING VEHICLE WARNING SPEAKER DEVICE
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United States of America Patent
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app pub date -
Mar 28, 2014
filing date -
Mar 28, 2014
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Abstract
An approaching vehicle warning speaker device includes a diaphragm that generates sound, an edge section joined to an outer edge of the diaphragm, and a frame supporting an outer periphery of the edge section. The diaphragm is made of a film containing polyimide. The edge section includes a base member made of fiber and rubber-containing waterproof layers provided on both sides of the base member.
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