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1984-02-28
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1980-02-05
Apparatus for controlling the position of a mining machine
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1981-02-27
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1969-06-10
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1975-08-30
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1981-01-28
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1978-01-24
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1964-06-15
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1976-05-31
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1981-10-06
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1992-06-15
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