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1987-11-05
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1988-02-10
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1982-09-30
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1984-09-19
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1992-05-13
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1987-05-27
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1986-08-13
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1989-08-28
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1989-09-28
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1988-06-09
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1983-07-27
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1986-12-17
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1985-06-12
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1988-09-01
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1987-11-25
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1987-07-27
Hydraulic mining method and apparatus
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1986-05-28
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1986-12-30
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1989-10-16
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1987-12-30
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1986-02-26
Security device and method
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1989-11-08
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1990-06-15
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