| 摘要 |
An extractor comprises several rotary blades in an extraction chamber of a closed type, inside rotary blade (11) sets up a base with a free situation and outside blade (12) sets up fixed at a circumstance wall part. Fig. 1 shows inside rotary blade, first rotary blade (1) are made of metal blade (la) by welding operation and second rotary blade (11) forms the sectional L type blade (11a).
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