| 摘要 |
<p>Extraction and dosing. The spiral device disclosed comprises at least one extraction element which is associated with means capable of inciting it to an angular displacement about an axis of sweep (6) passing through the supporting wall, has at least one wire-type terminal part extending at least in part in a radial direction with respect to the axis of sweep, is constrained to co-operate with, and to follow, the supporting wall during its angular displacement. Application to flour.</p> |
