| 摘要 |
The invention provides a pendent rock breaking device (10) comprising: a boom (12) having means for mounting a rock breaking tool (14) thereto; support means (18) for hanging the boom directory from an overhead fixture over a rock breaking area (24) and pivot means (20) provided at or towards one end of the boom allowing the boom to be pivoted freely in use in any direction over the rock breaking area (24).
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