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February 8, 2016

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Glaziers from MTH Industries replace a layer of protective coating over the glass surface on the floor of one of four transparent ledges that jut out from the 103rd floor of the Willis Tower in Chicago on Thursday, May 29, 2014.

M. Spencer Green / AP

Glaziers from MTH Industries replace a layer of protective coating over the glass surface on the floor of one of four transparent ledges that jut out from the 103rd floor of the Willis Tower in Chicago on Thursday, May 29, 2014.