November 21, 2002--Level A: To cut a smooth circle, a tile layer shaves off a fraction of a tile with an electric grinder. He cut a template from a piece of cardboard with a utility knife before cutting the tile.

November 21, 2002--Level 1, Atrium: Sheet metal workers prepare to remove the last air vent from the edge of Level 3 in the atrium.

November 21, 2002--Level 1: A pipe fitter alternately welds and then files, welds then files, to join two sections of pipe smoothly.

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