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<p>sensors, similar in principle to <a href="page.php?w=magnetic_core_memory">magnetic core memory</a> except that the output was controlled by control windings analogous to the windings of a <a href="page.php?w=relay">relay</a>.  Specifically, the ferrod was a transformer with four windings.  Two small windings ran through holes in the center of a rod of ferrite.  A pulse on the Interrogate winding was induced into the Readout winding, if the ferrite was not <a href="page.php?w=Saturation_%28magnetic%29">magnetically saturated</a>.  The larger</p><p>
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