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1Trafodyn Cynhadledd LlyfrCyhoeddwyd 1995“...American Society of Mechanical Engineers. Manufacturing Engineering Division...”
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2Trafodyn Cynhadledd LlyfrCyhoeddwyd 1995“...American Society of Mechanical Engineers. Manufacturing Engineering Division...”
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3Trafodyn Cynhadledd LlyfrCyhoeddwyd 1995“...American Society of Mechanical Engineers. Manufacturing Engineering Division...”
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4Trafodyn Cynhadledd“...American Society of Mechanical Engineers. Manufacturing Engineering Division...”