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<p>[QUOTE=&quot;KingofThings, post: 163811, member: 468&quot;]I&#039;ve seen these before and in the Navy. I even have one but don&#039;t recall exactly what it&#039;s for. I suspect the clearances are indeed there to protect an instrument of some type. Perhaps some calibration equipment.</p><p>Foam padding would&#039;ve been put on top of it and there was probably more for the sides and under it.[/QUOTE]</p><p><br /></p>

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