| 摘要 |
<p>The description is substantially that of the parent Specification, but the claims relate to the vertical adjustment of the aertor drive-shaft and impeller as a unit relatively to the level of effluent in a basin to adjust the depth of impeller immersion.ALSO:The description is substantially that of the parent Specification, but the claims relate to the vertical adjustment of the aerator drive shaft and impeller as a unit relatively to the level of effluent in a basin, to adjust the depth of impeller immersion.</p> |
