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An Entity of Type : prov:Entity, within Data Space : webisadb.webdatacommons.org associated with source dataset(s)

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  • l seams containing gas to be collected and thereafter extending the shaft to a preselected depth below the lowest seam from which gas is to be collected to create a sump; (b) lowering a movable and rotatable platform to a position adjacent a coal seam containing said methane gas; (c) drilling a generally horizontal hole from the platform into said coal seam containing methane gas adjacent said mov
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