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| 0000080172-16-000034-index.html | 2016-02-16 16:10:14 | |
| 0000080172-16-000034.txt | 2016-02-16 16:10:14 | |
| npk-20160212x8k.htm | 37032 | 2016-02-16 16:10:14 |
| npk-20160212xex99.htm | 23747 | 2016-02-16 16:10:14 |