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| 0000080172-18-000013-index.html | 2018-04-23 16:33:11 | |
| 0000080172-18-000013.txt | 2018-04-23 16:33:11 | |
| npk-20180419x8k.htm | 42390 | 2018-04-23 16:33:11 |
| npk-20180419xex99_1.htm | 6010 | 2018-04-23 16:33:11 |