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rdfs:comment | - A dial tone (also dialtone) is a signal used on a telephone handset to indicate that the telephone system is working and the handset is ready to make a call. The tone stops when the first number is dialed.
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abstract | - A dial tone (also dialtone) is a signal used on a telephone handset to indicate that the telephone system is working and the handset is ready to make a call. The tone stops when the first number is dialed.
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