New York, NY, United States of America
Zero Crossing is a clock pendulum crossing through the zero reference position.
Zero Crossing is the dead center point of a waveform at 0 dB on the horizontal axis.
Zero Crossing is a point where the sign of a function changes (from positive to negative), represented by a crossing of the axis (zero value) in the graph of the function.
Zero Crossing makes really cool devices.
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United States Postal Service: First Class
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