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| Dust explosion damage to top of elevator. | 76 |
| November 2012 | December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | |
| Dust explosion damage to top of elevator. | 3 | 7 | 12 | 4 | 4 | 6 | 4 |
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