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| 0000080172-18-000006-index.html | 2018-02-28 16:01:56 | |
| 0000080172-18-000006.txt | 2018-02-28 16:01:56 | |
| npk-20180226x8k.htm | 41412 | 2018-02-28 16:01:56 |
| npk-20180226xex99_1.htm | 5989 | 2018-02-28 16:01:56 |