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| 0000080172-17-000004-index.html | 2017-01-09 16:02:10 | |
| 0000080172-17-000004.txt | 2017-01-09 16:02:10 | |
| npk-20170103x8k.htm | 53330 | 2017-01-09 16:02:10 |
| npk-20170103xex2_1.htm | 445169 | 2017-01-09 16:02:10 |
| npk-20170103xex99_1.htm | 9865 | 2017-01-09 16:02:10 |
| npk-20170103xex99_2.htm | 593905 | 2017-01-09 16:02:10 |