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发明名称
Aus zwei konzentrisch ineinanderliegenden und sich in Keilflaechen beruehrenden Ringen bestehender Kolbenring
摘要
申请公布号
DE519195(C)
申请公布日期
1931.02.25
申请号
DENDATB125464D
申请日期
申请人
GEORG BEER
发明人
分类号
F16J9/20
主分类号
F16J9/20
代理机构
代理人
主权项
地址
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