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发明名称
Perfectionnements aux tubes
摘要
申请公布号
FR723431(A)
申请公布日期
1932.04.08
申请号
FRD723431
申请日期
1931.09.28
申请人
发明人
BERGSTROM ERIC MAURICE;DIGBY WILLIAM POLLARD
分类号
F16L9/04
主分类号
F16L9/04
代理机构
代理人
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