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<p>future standards and products.</p>

<p><big>Usage</big></p>
<p><big>In hardware</big></p>
<p>A simple example of both backward and forward compatibility is the introduction of <a href="page.php?w=FM_broadcasting">FM radio</a> in <a href="page.php?w=stereophonic_sound">stereo</a>. FM radio was initially <a href="page.php?w=monaural">mono</a>, with only one audio channel represented by one <a href="page.php?w=signal_%28electrical_engineering%29">signal</a>. With the introduction of two-channel stereo FM radio, many listeners had only mono FM receivers. Forward compatibility</p><p>
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