| 摘要 |
<p>1,043,687. Mineral-mining methods. HARPENER BERGBAU-A.G. July 16, 1965 [Oct. 23, 1964], No. 30217/65. Heading E1F. Mining of a steep measure of mineral involves driving at intervals between a bottom road and a top road of the measure rise headings, each of which is converted, before mining occurs of mineral in the panels defined by the headings, into a load-carrying concrete pillar by being filled with a concrete mix after a tube has been laid through the heading; the tube permitting passage of the haulage means between the top and bottom roads of the mining machine used for mining out a panel.</p> |
