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1987-11-05
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1985-07-29
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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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1990-06-13
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EP0170123A3
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1986-08-13
Process and device for sealing dams in under-ground galleries, especially in salt mines
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1989-09-28
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1988-06-09
Method and device for sealing in underground mines
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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
Safety device and method for underground mining
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1987-07-27
Hydraulic mining method and apparatus
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1986-05-28
Method of timing,and timing device for use in underground mining operation
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1986-12-30
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1989-10-16
Control and interlock system for an underground demetanizing station used in deep mines
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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
Method and device for making of underground stopes
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1989-05-02
Method of blowing of fly-ash for filling in underground works and device for that method application