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    1. That moment, every bell in the Snack J began ringing-the bell over the door, the chimes by the windows, the bell by the bar.
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    2. Subsets of frequency response are physical microphonics, electronic ringing and oscillation, and acoustic ringing.
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    3. The waveform of the induced current is a decreased ringing wave and the ringing period equals twice to the time of induced current flowing along flyer and exhaust plume.
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    4. The first selection circuit is controlled by a fundamental input/output system to decide whether a ringing indicative signal is transmitted to the ringing indicative pin.
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    5. Subsets of frequency response are physical microphonics, electronic ringing and oscillation, and acoustic ringing.
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