Parent Directory| Name | Size | Last Modified |
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| 0000080172-18-000036-index.html | 2018-10-18 16:04:04 | |
| 0000080172-18-000036.txt | 2018-10-18 16:04:04 | |
| npk-20181017x8k.htm | 41696 | 2018-10-18 16:04:04 |
| npk-20181017xex99_1.htm | 8184 | 2018-10-18 16:04:04 |