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1Cyhoeddwyd 1973Trafodyn Cynhadledd Llyfr
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2Cyhoeddwyd 1993“...DE (Series) (American Society of Mechanical Engineers. Design Engineering Division)...”
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3Cyhoeddwyd 1992“...DE (Series) (American Society of Mechanical Engineers. Design Engineering Division)...”
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4Cyhoeddwyd 1993“...DE (Series) (American Society of Mechanical Engineers. Design Engineering Division)...”
Trafodyn Cynhadledd Llyfr -
5Cyhoeddwyd 1992“...DE (Series) (American Society of Mechanical Engineers. Design Engineering Division)...”
Trafodyn Cynhadledd Llyfr