| 摘要 |
PROBLEM TO BE SOLVED: To provide a compressor having a simple structure and a small number of parts. SOLUTION: A substance in a groove becomes a stated where it is shielded from the outside by engaging grooves of cone-shaped screws having a right/left symmetrical shape or an approximately right/left symmetrical shape each other. The substance is pushed to a tip end of the cone and is compressed by reversely rotating two screws respectively.
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