An acoustic device having a heat producing device, such as an amplifier and a heat sink for transferring heat from the amplifier. The acoustic device has a cone having an inner surface, and a support structure defining a volume. The heat producing element and the heat sink are positioned in the volume.

 
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> Non-volatile semiconductor memory device having sense amplifier with increased speed

> Duplex image forming device having a reversible transportation unit inserted into an image forming device

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