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发明名称
METHOD OF MANUFACTURING HOLLOW BALL FOR BALL VALVES
摘要
申请公布号
JPS5230256(A)
申请公布日期
1977.03.07
申请号
JP19750106552
申请日期
1975.09.04
申请人
SHIN NIPPON KOUKIYUU KK
发明人
YAMAZAKI KATSUHIRO
分类号
B21D51/08;B21D22/20;B21D51/00
主分类号
B21D51/08
代理机构
代理人
主权项
地址
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