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发明名称
Seal
摘要
申请公布号
US2401539(A)
申请公布日期
1946.06.04
申请号
US19430514900
申请日期
1943.12.20
申请人
BENSON GERALD L
发明人
BENSON GERALD L.
分类号
F16J15/32
主分类号
F16J15/32
代理机构
代理人
主权项
地址
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