Category:Lightening holes

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English: Lightening holes are holes cut in a structure to make it lighter.
<nowiki>Lightening holes; 肉抜き穴; trou d'allègement; 라이트닝홀; 何らかの構造を軽量化するために開けられる穴</nowiki>
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Media in category "Lightening holes"

The following 90 files are in this category, out of 90 total.