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2020
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Invention
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Mine roof support, pre-installation assembly for same, and method of installation. A mine roof su... |
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2017
|
Invention
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Telescopic mine roof support. A longitudinally yieldable support for underground roof support inc... |
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|
Invention
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Ventilated mine roof support. A longitudinally yieldable support for underground roof support inc... |
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2016
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Invention
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Telescopic mine roof support.
A longitudinally yieldable support for underground roof support in... |
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2014
|
Invention
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Support for use in mine. A support comprising an outer casing having a main axis, the outer casin... |
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2004
|
Invention
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Mine prop. A mine prop is comprised of an elongate tube having a slenderness ratio that would gen... |
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1981
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Invention
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Method for making a concrete block. A method for making metal fiber reinforced concrete block whi... |
