버밍엄 규격은 어떤 책이나 규범에서 나온 것인가요?
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현명하신 분께서 원본이나 신뢰할 수 있는 출처를 알려주시면 감사하겠습니다. O(∩_∩)O 감사합니다
《냉간 프레스 가공 매뉴얼》P592
요새화됐다........
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