Type of perforation Qv - square holes with staggered rows.jpg
en
Type of perforation Qv square holes with staggered rows, perforation
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en
Type of perforation Qv square holes with staggered rows, Perforation diagrams
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ja
穿孔の種類 Qv 四角い穴に突き出た列、穿孔
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ja
穴の種類 Qv 四角い穴に、穴があいたもの。
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perforation penetration stagger