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| 0000080172-17-000033-index.html | 2017-07-31 16:04:38 | |
| 0000080172-17-000033.txt | 2017-07-31 16:04:38 | |
| npk-20170728x8k.htm | 40261 | 2017-07-31 16:04:38 |
| npk-20170728xex99_1.htm | 45710 | 2017-07-31 16:04:38 |