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| 0000080172-16-000042-index.html | 2016-04-12 16:00:47 | |
| 0000080172-16-000042.txt | 2016-04-12 16:00:47 | |
| npk-20160407x8k.htm | 38732 | 2016-04-12 16:00:47 |
| npk-20160407xex99_1.htm | 7321 | 2016-04-12 16:00:47 |