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| 0000080172-17-000007-index.html | 2017-02-13 16:12:08 | |
| 0000080172-17-000007.txt | 2017-02-13 16:12:08 | |
| npk-20170210x8k.htm | 38476 | 2017-02-13 16:12:08 |
| npk-20170210xex99_1.htm | 24397 | 2017-02-13 16:12:08 |