| 摘要 |
<p>A vacuum excavation system which incorporates a low consumption air lance (1), a highly efficient multi-stage vacuum generation system (4) effectively isolated from the waste stream and the air source (9), and a highly portable material collection system (5). The air lance includes a cylindrical main body (11) which narrows to a flat tapered nozzle (12) at the digging end, and a tee-shaped handle (15) with a swivel type air fitting (14) at one end.</p> |
