X-RAY EXAMINATION SYSTEM FOR EXAMINING THE WELDED PORTIONS AT BOTH ENDS OF STEEL PIPES von SHIMADZU METAL IND LTD,JA, ITO K,JA, TSUBOYAMA S,JA, MATSUI K,JA, KOIZUMI T,JA, WATANABE H,JA, FUJII S,JA, SATO S,JA

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