books pop hole
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ثقب منبثق (Info)
ثقب مُنْبثَق:- تشكيل ثقب باستخدام سنبك مستدق يتولى عمل ثقب أولي في المشغولة ثم يدفع هذا السنبك في الثقب ليشكل شفة مع توسيع الثقب الأصلي. (معجم الهندسة الميكانيكية)
