| 摘要 |
<p>1,142,850. Mine roadway-excavating machine. COAL INDUSTRY (PATENTS) Ltd. 3 June, 1966 [8 June, 1965], No. 24208/65. Heading E1F. In a mine roadway-excavating machine having pick-armed, endless chains 10 circulating about a boom 2 projecting beyond the chassis 1 of the machine the vertical swing of the boom 2 about a horizontal axis 15 on the chassis is such that free end of the boom can be brought below the level on which the machine stands for cutting away of mineral from said level down to the required floor of a roadway being formed by the machine.</p> |
