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发明名称
FLOTATION COLLAR
摘要
申请公布号
GB1585058(A)
申请公布日期
1981.02.25
申请号
GB19760027340
申请日期
1977.07.26
申请人
PENK LTD
发明人
分类号
B63B21/20;F16L1/24;(IPC1-7):B63B21/52
主分类号
B63B21/20
代理机构
代理人
主权项
地址
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