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coil spring /ˈkɔɪl ˈspɹɪŋ/ n

中文：螺旋弹簧

中文 · 螺旋弹簧Español · muelle helicoidalFrançais · ressort en spirale
Meaning：Instrument that tightens as the shade cloth is lowered and that pulls it up as it relaxes.
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Found in these illustrated scenes（2）

Blind parts Car systems

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