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<p>as the use of automatic controls in later European machines or the use of conical <a href="page.php?w=valve">valve</a>s in the work of <a href="page.php?w=Leonardo_da_Vinci">Leonardo da Vinci</a>.</p>

<p><big>Mechanisms and components</big></p>
<p><big>Automatic controls</big></p>
<p>The Banu Musa brothers described a number of early <a href="page.php?w=automatic_control">automatic control</a>s. Two-step level controls for fluids, an early form of discontinuous <a href="page.php?w=variable_structure_control">variable structure control</a>s, were developed by</p><p>
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