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1984-06-27
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1983-06-22
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1984-02-22
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1983-09-07
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1982-01-05
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1983-04-07
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1983-06-22
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1985-08-08
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1982-03-16
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1982-01-05
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1981-09-29
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1982-02-17
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1984-02-29
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1985-08-17
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1990-03-22
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1979-02-15
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1981-12-01
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1987-01-21
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1982-09-30
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1980-03-11
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1981-09-28
wind turbine rotor
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1986-02-25
VARIABLE PITCH WIND ROTOR
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1982-09-30
ROTORS VERTICALS WIND TURBINE
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1983-11-01
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1980-12-16
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