hongbaoshu - yd-hd.com · 1 2 3.1 jb/t 5000. 8— the heavy mechanical general techniques and...
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- hongbaoshu - yd-hd.com · 1 2 3.1 JB/T 5000. 8— The heavy mechanical general techniques and standards Forging GB 223 GB 226 GB 228— 87 GB 229 94 GB 231 84 GB 1979 —80
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