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Low profile rod pumping unit with pneumatic counterbalance for the active control of the rod string |
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2019-09-24 |
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Control system and method of controlling a rod pumping unit |
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Low profile rod pumping unit with pneumatic counterbalance for the active control of the rod string |
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2015-08-25 |
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Microstrap antenna |
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1993-07-20 |
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Microstrip patch antenna system |
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1987-04-21 |
