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| 0000080172-18-000003-index.html | 2018-02-12 16:11:42 | |
| 0000080172-18-000003.txt | 2018-02-12 16:11:42 | |
| npk-20180209x8k.htm | 38219 | 2018-02-12 16:11:42 |
| npk-20180209xex99_1.htm | 25964 | 2018-02-12 16:11:42 |