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| 0000950123-18-007190-index.html | 2018-07-31 16:05:14 | |
| 0000950123-18-007190.txt | 2018-07-31 16:05:14 | |
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| pten-ex121_12.htm | 138092 | 2018-07-31 16:05:14 |
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| pten-s4.htm | 626009 | 2018-07-31 16:05:14 |