Parent Directory| Name | Size | Last Modified |
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| 0000080172-19-000013-index.html | 2019-04-29 16:31:12 | |
| 0000080172-19-000013.txt | 2019-04-29 16:31:12 | |
| npk-20190426x8k.htm | 39944 | 2019-04-29 16:31:12 |
| npk-20190426xex99_1.htm | 31174 | 2019-04-29 16:31:12 |