<!-- Size: 140 px -- >
<a href="/cliparts/O/o/v/9/8/l/oscilloscope-square-wave-th.png"><img src="/cliparts/O/o/v/9/8/l/oscilloscope-square-wave-th.png" alt='Oscilloscope-square Wave clip art'/></a>
<!-- Size: 340 px -- >
<a href="/cliparts/O/o/v/9/8/l/oscilloscope-square-wave-md.png"><img src="/cliparts/O/o/v/9/8/l/oscilloscope-square-wave-md.png" alt='Oscilloscope-square Wave clip art'/></a>
<!-- Size: 640 px -- >
<a href="/cliparts/O/o/v/9/8/l/oscilloscope-square-wave-hi.png"><img src="/cliparts/O/o/v/9/8/l/oscilloscope-square-wave-hi.png" alt='Oscilloscope-square Wave clip art'/></a>
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