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( 3 ) Volcanic ashes can bring failures in function to electronic devices
A magnet, a radar and a watch often don't normally work around a place covered with volcanic ashes.
Accordingly, even if those devices are used in a room, influences on those devices can depend on the position of the device ( or the user ).
By the way, phosphoric graphite is a kind of phosphorus contained in volcanic ashes, as this matter has a feature to absorb electric waves, it's usable for electric wave-observer.
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