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| 0000080172-16-000045-index.html | 2016-05-02 16:03:24 | |
| 0000080172-16-000045.txt | 2016-05-02 16:03:24 | |
| npk-20160429x8k.htm | 38302 | 2016-05-02 16:03:24 |
| npk-20160429xex99_1.htm | 25723 | 2016-05-02 16:03:24 |