| 摘要 |
In one preferred form of the present invention shown in Figure 1, there is provided an airflow restriction device for mining ventilation. The airflow restriction device comprises a body having an inflatable portion. The inflatable portion is inflatable to provide a ring-type restrictor that is able to expand inwardly to reduce an inner channel area and provide a restriction to air flow Co) C)o Co) CoY CoY L13o |
