The metal objects and debris, in aviation industry so called FOD (FOREIGN OBJECT DEBRIS) includes metal objects like the metallic bolts, nuts, nails, needles, washers, buckles, thumbtacks, springs, coins and many other metal objects like parts of GSE equipment and belongings of the airport personnel or passengers inadvertently left on the ground and especially the sweeper brushes - bristles or other nearly invisible tiny metal fragments and metal dust.
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