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1 2.
     96 ( 30 .)
30.07.2016, 13:05
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2 16.11.2012, 23:49
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     66 ( 30 .)
20.01.2012, 22:46
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     :2012-02-06, 05:48:35-, . ....


4 / Venezuela heavy Oil production
     62 ( 30 .)
30.12.2012, 02:05
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     :2015-08-31, 22:13:30-, ! ....


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19.06.2012, 15:46
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     :2012-06-19, 16:10:58- ....


6 1.
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30.07.2016, 13:06
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7 ()
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09.06.2011, 00:32
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16.04.2012, 11:03
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     :2012-06-19, 19:05:33-, ....


10 : / Disintegrating Frac Balls for Multi-Stage Fracturing: Avoid Having to Mill the Balls Out, Save Time 14.11.2012, 23:16
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