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申请公布号:
GB1491359(A)
申请号:
GB19750028386
申请日期:
1975.07.04
申请公布日期:
1977.11.09
申请人:
BVS
分类号:
F16L1/24;(IPC1-7):B63B21/52
主分类号:
F16L1/24
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