Square hollow section
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https://eng-calculations.com/SVG/EN/EN_10219-2/Square hollow section.svg
<img src="https://eng-calculations.com/SVG/EN/EN_10219-2/Square hollow section.svg" alt="Square_hollow_section" title="Square_hollow_section">
https://eng-calculations.com/SVG/EN/EN_10219-2/Square hollow section.svg