Type of perforation Qg - square holes in straight rows.jpg
en
Type of perforation Qg square holes in straight rows, perforation
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en
Type of perforation Qg square holes in straight rows, Perforation diagrams
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ja
穴の種類 Qg 直列の正四角形穴、穿孔
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ja
直線の穴のQg四角い穴、穿孔図
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perforation penetration