Image Credits

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Steel spring (8132603013).jpg

Author/source: liebeslakritze · License/source note: Creative Commons · https://commons.wikimedia.org/wiki/File:Steel_spring_(8132603013).jpg

Author/source: Taktoa · License/source note: CC BY-SA 3.0 · https://commons.wikimedia.org/wiki/File:CompressionSpring.jpg

Author/source: 在原ヶ谷戸 · License/source note: CC BY-SA 3.0 · https://commons.wikimedia.org/wiki/File:Metal_spring_20050521.jpg