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IMPROVEMENTS RELATING TO YIELDABLE CONNECTORS IN MINE ROADWAY SUPPORTS
IMPROVEMENTS RELATING TO YIELDABLE CONNECTORS IN MINE ROADWAY SUPPORTS
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机译：有关矿山巷道支持中可屈服连接器的改进
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1,242,562. Yielding mine roof supports. P. B. M. LITTLE [trading as HOLYWELL ENG. CO.]. 1 July, 1969 [5 April, 1968], No. 16657/68. Heading E1E. Mine arch sections 11 are yieldingly interconnected by a tubular member 12 having, intermediate its ends, at least one internally directed, longitudinally extending, indentation 14. The member 12 may consist of a pair of U-section steel pressing welded together.
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机译：1,242,562。屈服的矿井顶板支架。 P. B. M. LITTLE [交易为HOLYWELL ENG。 CO。]。 1969年7月1日[1968年4月5日]，编号16657/68。标题E1E。矿拱段11通过管状构件12屈服地互连，该管状构件在其端部中间具有至少一个内部指向的，纵向延伸的凹口14。该构件12可以由一对压制在一起的U形钢构成。
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